Sleep, learning and memory.
Babies method and freeze-dry memories during those many naps they take during the day, a new analysis suggests. "We discovered that sleeping shortly after knowledge helps infants to retain memories over extended periods of time," said memorize author Sabine Seehagen, a child and stripling psychology researcher with Ruhr University Bochum in Germany. "In both of our experiments, only those infants who took an extended shag for at least half an hour within four hours after lore remembered the information" view website. The chew over doesn't definitively confirm that the naps themselves inform the memories stick, but the researchers believe that is happening.
And "While males and females might assume that infants learn best when they are wide awake, our findings suggest that the rhythm just before infants go down for sleep can be a particularly valuable wisdom opportunity". Scientists have long linked more sleep to better memory, but it's been unclear what happens when babies shell out a significant amount of time sleeping. In the unfledged study, researchers launched two experiments. In each one, babies old 6 months or 12 months were taught how to obliterate mittens from animal puppets.
Showing posts with label sleep. Show all posts
Showing posts with label sleep. Show all posts
Friday, June 28, 2019
Tuesday, May 14, 2019
A Smartphone And A Child's Sleep
A Smartphone And A Child's Sleep.
A smartphone in a child's bedroom may debilitate super drowse habits even more than a TV, new research suggests. A investigate of more than 2000 elementary and middle-school students found that having a smartphone or plaquette in the bedroom was associated with less weekday sleep and feeling torpid in the daytime. "Studies have shown that traditional screens and screen time, take to TV viewing, can interfere with sleep, but much less is known about the impacts of smartphones and other niggardly screens," said study lead inventor Jennifer Falbe, of the School of Public Health at the University of California, Berkeley example. Small screens are of isolated concern because they demand access to a wide range of content, including games, videos, websites and texts, that can be reach-me-down in bed and delay sleep.
They also pour out audible notifications of incoming communications that may interrupt sleep. "We found that both sleeping near a meagre screen and sleeping in a room with a TV set were interconnected to shorter weekday sleep duration. Children who slept near a peewee screen, compared to those who did not, were also more likely to sensible of like they did not get enough sleep". The findings were published online Jan 5, 2015 and in the February replica issue of the logbook Pediatrics.
And "Despite the importance of sleep to child health, enlargement and performance in school, many children are not sleeping enough. Preteen school-aged children needfulness at least 10 hours of catch forty winks each day, while teenagers need between nine and 10, the US National Heart, Lung, and Blood Institute advises. For this study, the researchers focused on the slumber habits of nearly 2050 boys and girls who had participated in the Massachusetts Childhood Obesity Research Demonstration Study in 2012-2013.
A smartphone in a child's bedroom may debilitate super drowse habits even more than a TV, new research suggests. A investigate of more than 2000 elementary and middle-school students found that having a smartphone or plaquette in the bedroom was associated with less weekday sleep and feeling torpid in the daytime. "Studies have shown that traditional screens and screen time, take to TV viewing, can interfere with sleep, but much less is known about the impacts of smartphones and other niggardly screens," said study lead inventor Jennifer Falbe, of the School of Public Health at the University of California, Berkeley example. Small screens are of isolated concern because they demand access to a wide range of content, including games, videos, websites and texts, that can be reach-me-down in bed and delay sleep.
They also pour out audible notifications of incoming communications that may interrupt sleep. "We found that both sleeping near a meagre screen and sleeping in a room with a TV set were interconnected to shorter weekday sleep duration. Children who slept near a peewee screen, compared to those who did not, were also more likely to sensible of like they did not get enough sleep". The findings were published online Jan 5, 2015 and in the February replica issue of the logbook Pediatrics.
And "Despite the importance of sleep to child health, enlargement and performance in school, many children are not sleeping enough. Preteen school-aged children needfulness at least 10 hours of catch forty winks each day, while teenagers need between nine and 10, the US National Heart, Lung, and Blood Institute advises. For this study, the researchers focused on the slumber habits of nearly 2050 boys and girls who had participated in the Massachusetts Childhood Obesity Research Demonstration Study in 2012-2013.
Saturday, April 20, 2019
Heart Risk For Elderly People Increases When Sleep Apnea
Heart Risk For Elderly People Increases When Sleep Apnea.
The snoring and breathing disturbances of have a zizz apnea may be more than just a nuisance, with a different examine linking the mould to higher risks for heart failure and heart malady in middle-aged and older men read more here. However, the study found no correlation between snore apnea and coronary heart disease in women, or in men older than 70.
And "The translation here is that there is a lot of undiagnosed sleep apnea, and that, at least in men, it is associated with the evolvement of coronary quintessence disease and heart failure. Only about 10 percent of zizz apnea cases are diagnosed," said Dr Daniel Gottlieb, mate professor of medicine, Boston University School of Medicine. Gottlieb respected that while the jump in heart imperil was noteworthy, it was not as large as that seen in previous clinic-based studies of sleep apnea because the participants were fatigued from a broad community-based population.
According to background message in the study, sleep apnea sufferers awaken rapidly during the night struggling to breathe, often experiencing a shot of blood pressure- raising adrenaline. Most often, they go good back to sleep, uninformed of what happened. But the awakenings are repeated, sometimes up to 30 times an hour, depriving the sufferer of central oxygen and unimpaired sleep.
The research is published online July 12 in Circulation. In the study, almost 2000 men and about 2500 women - all unfasten of soul problems at the beginning of the research - were recorded as they slept using polysomnograms, which well-thought-out the presence and severity of sleep apnea as calibrated on the Apnea-Hypopnea Index. About half had no symptoms of siesta apnea, the rig found, while half had mild, fair to middling or severe symptoms.
Participants were then contacted at various times from 1998 to the final backup in April 2006. During that time, 473 cardiac events occurred, including 185 concern attacks, 212 pump bypass operations, and 76 deaths. There were also 308 cases of basics failure; of these 144 people also had a understanding attack.
The snoring and breathing disturbances of have a zizz apnea may be more than just a nuisance, with a different examine linking the mould to higher risks for heart failure and heart malady in middle-aged and older men read more here. However, the study found no correlation between snore apnea and coronary heart disease in women, or in men older than 70.
And "The translation here is that there is a lot of undiagnosed sleep apnea, and that, at least in men, it is associated with the evolvement of coronary quintessence disease and heart failure. Only about 10 percent of zizz apnea cases are diagnosed," said Dr Daniel Gottlieb, mate professor of medicine, Boston University School of Medicine. Gottlieb respected that while the jump in heart imperil was noteworthy, it was not as large as that seen in previous clinic-based studies of sleep apnea because the participants were fatigued from a broad community-based population.
According to background message in the study, sleep apnea sufferers awaken rapidly during the night struggling to breathe, often experiencing a shot of blood pressure- raising adrenaline. Most often, they go good back to sleep, uninformed of what happened. But the awakenings are repeated, sometimes up to 30 times an hour, depriving the sufferer of central oxygen and unimpaired sleep.
The research is published online July 12 in Circulation. In the study, almost 2000 men and about 2500 women - all unfasten of soul problems at the beginning of the research - were recorded as they slept using polysomnograms, which well-thought-out the presence and severity of sleep apnea as calibrated on the Apnea-Hypopnea Index. About half had no symptoms of siesta apnea, the rig found, while half had mild, fair to middling or severe symptoms.
Participants were then contacted at various times from 1998 to the final backup in April 2006. During that time, 473 cardiac events occurred, including 185 concern attacks, 212 pump bypass operations, and 76 deaths. There were also 308 cases of basics failure; of these 144 people also had a understanding attack.
Thursday, April 11, 2019
Breathing Problems During Sleep Are Related To Air Pollution
Breathing Problems During Sleep Are Related To Air Pollution.
A redesigned scrutinize has found a tie between air pollution and breathing-related disruptions during sleep. Conducted by the Harvard School of Public Health and Brigham & Women's Hospital, the authors aver this the in the first place attempt to document a association between exposure to pollution and sleep-disordered breathing extra resources. Breathing-related log a few zees disruptions come in several forms, of which the best known is sleep apnea.
It causes hoi polloi to repeatedly wake up when their airways constrict and breathing is cut off. In many cases, sufferers don't fulfil they have the condition, which can furnish to the development of heart disease and stroke. In the study, researchers tried to contrive if air pollution - which irritates the airways - has anything to do with beauty sleep disruptions, which move an estimated 17 percent of adults in the United States.
A redesigned scrutinize has found a tie between air pollution and breathing-related disruptions during sleep. Conducted by the Harvard School of Public Health and Brigham & Women's Hospital, the authors aver this the in the first place attempt to document a association between exposure to pollution and sleep-disordered breathing extra resources. Breathing-related log a few zees disruptions come in several forms, of which the best known is sleep apnea.
It causes hoi polloi to repeatedly wake up when their airways constrict and breathing is cut off. In many cases, sufferers don't fulfil they have the condition, which can furnish to the development of heart disease and stroke. In the study, researchers tried to contrive if air pollution - which irritates the airways - has anything to do with beauty sleep disruptions, which move an estimated 17 percent of adults in the United States.
Thursday, February 21, 2019
US Scientists Studying The Problem Of Sleep Quality
US Scientists Studying The Problem Of Sleep Quality.
Having tortuous parents and mood connected to infuse with increase the likelihood that a teen will get sufficient sleep, a further study finds in Dec 2013. Previous check out has suggested that developmental factors, specifically lower levels of the sleep-inducing hormone melatonin, may simplify why children get less sleep as they become teenagers here. But this investigation - published in the December issue of the Journal of Health and Social Behavior - found that sexually transmitted ties, including relationships with parents and friends, may have a more significant object on changing rest patterns in teens than biology.
And "My study found that social ties were more influential than biological development as predictors of teen sleep behaviors," David Maume, a sociology professor at the University of Cincinnati, said in a scuttlebutt pass out from the American Sociological Association. Maume analyzed evidence collected from nearly 1000 young people when they were venerable 12 to 15. During these years, the participants' undistinguished sleep duration fell from more than nine hours per indoctrinate night to less than eight hours.
Having tortuous parents and mood connected to infuse with increase the likelihood that a teen will get sufficient sleep, a further study finds in Dec 2013. Previous check out has suggested that developmental factors, specifically lower levels of the sleep-inducing hormone melatonin, may simplify why children get less sleep as they become teenagers here. But this investigation - published in the December issue of the Journal of Health and Social Behavior - found that sexually transmitted ties, including relationships with parents and friends, may have a more significant object on changing rest patterns in teens than biology.
And "My study found that social ties were more influential than biological development as predictors of teen sleep behaviors," David Maume, a sociology professor at the University of Cincinnati, said in a scuttlebutt pass out from the American Sociological Association. Maume analyzed evidence collected from nearly 1000 young people when they were venerable 12 to 15. During these years, the participants' undistinguished sleep duration fell from more than nine hours per indoctrinate night to less than eight hours.
Tuesday, February 19, 2019
Duration Of Sleep Affects The Body Of A Teenager
Duration Of Sleep Affects The Body Of A Teenager.
Kids who don't get enough be in the arms of Morpheus at twilight may go through a slight spike in their blood pressure the next epoch even if they are not overweight or obese, a new study suggests. The into or included 143 kids aged 10 to 18 who all in one night in a sleep lab for observation. They also wore a 24-hour blood require monitor and kept a seven-day zizz diary go here. The participants were all normal weight.
None had significant sleep apnea - a circumstance characterized by disrupted breathing during sleep. The slumber disorder has been linked to high blood pressure. According to the findings, just one less hour of drop per night led to an enhancement of 2 millimeters of mercury (mm/Hg) in systolic blood pressure. That's the foremost number in a blood prevail upon reading. It gauges the pressure of blood moving through arteries.
One less hour of every night sleep also led to a 1 mm/Hg go up in diastolic blood pressure. That's bottom number, which measures the resting sway in the arteries between heart beats. Catching up on saw wood over the weekend can help improve blood pressure somewhat, but is not enough to wrong side this effect entirely, report researchers led by Chun Ting Au, at the Chinese University of Hong Kong.
So, even though the overall take place of repose loss on blood pressure was small, it could have implications for peril of heart disease in the future, they suggested. Exactly how bygone sleep leads to increases in blood pressure is not fully understood, but Au and colleagues take a chance that it may give rise to increases in stress hormones, which are known to affect blood pressure. The findings are published online Dec 16, 2013 and in the January rotogravure come of Pediatrics.
Kids who don't get enough be in the arms of Morpheus at twilight may go through a slight spike in their blood pressure the next epoch even if they are not overweight or obese, a new study suggests. The into or included 143 kids aged 10 to 18 who all in one night in a sleep lab for observation. They also wore a 24-hour blood require monitor and kept a seven-day zizz diary go here. The participants were all normal weight.
None had significant sleep apnea - a circumstance characterized by disrupted breathing during sleep. The slumber disorder has been linked to high blood pressure. According to the findings, just one less hour of drop per night led to an enhancement of 2 millimeters of mercury (mm/Hg) in systolic blood pressure. That's the foremost number in a blood prevail upon reading. It gauges the pressure of blood moving through arteries.
One less hour of every night sleep also led to a 1 mm/Hg go up in diastolic blood pressure. That's bottom number, which measures the resting sway in the arteries between heart beats. Catching up on saw wood over the weekend can help improve blood pressure somewhat, but is not enough to wrong side this effect entirely, report researchers led by Chun Ting Au, at the Chinese University of Hong Kong.
So, even though the overall take place of repose loss on blood pressure was small, it could have implications for peril of heart disease in the future, they suggested. Exactly how bygone sleep leads to increases in blood pressure is not fully understood, but Au and colleagues take a chance that it may give rise to increases in stress hormones, which are known to affect blood pressure. The findings are published online Dec 16, 2013 and in the January rotogravure come of Pediatrics.
Tuesday, January 15, 2019
Golf prevents death
Golf prevents death.
Treating their snooze apnea improved middle-aged men's golf games, according to a close-fisted recent study. "The degree of improvement was most substantial in the better golfers who have done a unequalled job of managing the technical and mechanical aspects of golf," said burn the midnight oil lead author Dr Marc Benton, medical pilot of SleepWell Centers of New Jersey, in Madison worldmedexpert.com. Researchers looked at 12 men with an mean era of 55 who had moderate to severe obstructive sleep apnea.
The nap disorder is characterized by frequent episodes of disrupted breathing during sleep. Their golf acting was assessed before and after up to six months of a catch forty winks apnea treatment called continuous positive airway squeezing (CPAP), which helps keep a person's airway get going by providing a steady stream of air during sleep. The psychotherapy led to less daytime sleepiness and improved sleep-related nobility of life.
Treating their snooze apnea improved middle-aged men's golf games, according to a close-fisted recent study. "The degree of improvement was most substantial in the better golfers who have done a unequalled job of managing the technical and mechanical aspects of golf," said burn the midnight oil lead author Dr Marc Benton, medical pilot of SleepWell Centers of New Jersey, in Madison worldmedexpert.com. Researchers looked at 12 men with an mean era of 55 who had moderate to severe obstructive sleep apnea.
The nap disorder is characterized by frequent episodes of disrupted breathing during sleep. Their golf acting was assessed before and after up to six months of a catch forty winks apnea treatment called continuous positive airway squeezing (CPAP), which helps keep a person's airway get going by providing a steady stream of air during sleep. The psychotherapy led to less daytime sleepiness and improved sleep-related nobility of life.
Friday, January 4, 2019
People Often Die In Their Sleep
People Often Die In Their Sleep.
People with siesta apnea and hard-to-control peak blood on may see their blood pressure drop if they treat the be in the arms of Morpheus disorder, Spanish researchers report. Continuous positive airway squeezing (CPAP) is the standard treatment for sleep apnea, a get characterized by disrupted breathing during sleep. The repose disorder has been linked to high blood pressure for more. Patients in this inquiry were taking three or more drugs to lower their blood pressure, in addition to having catnap apnea.
Participants who used the CPAP device for 12 weeks reduced their diastolic blood compression (the bottom calculate in a blood pressure reading) and improved their overall nighttime blood pressure, the researchers found. "The ubiquity of sleep apnea in patients with ungovernable high blood pressure is very high," said result in researcher Dr Miguel-Angel Martinez-Garcia, from the Polytechnic University Hospital in Valencia. "This nap apnea healing increases the probability of recovering the normal nocturnal blood to pattern.
Patients with resistant high blood pressure should undergo a have a zizz study to rule out obstructive sleep apnea, Martinez-Garcia said. "If the pertinacious has sleep apnea, he should be treated with CPAP and subject oneself to blood pressure monitoring". The report, published in the Dec 11, 2013 originate of the Journal of the American Medical Association, was partly funded by Philips-Respironics, maker of the CPAP technique employed in the study.
The CPAP system consists of a motor that pushes divulge through a tube connected to a mask that fits over the patient's entry and nose. The device keeps the airway from closing, and thus allows ceaseless sleep. Sleep apnea is a proverbial disorder. The pauses in breathing that patients familiarity can last from a few seconds to minutes and they can occur 30 times or more an hour.
People with siesta apnea and hard-to-control peak blood on may see their blood pressure drop if they treat the be in the arms of Morpheus disorder, Spanish researchers report. Continuous positive airway squeezing (CPAP) is the standard treatment for sleep apnea, a get characterized by disrupted breathing during sleep. The repose disorder has been linked to high blood pressure for more. Patients in this inquiry were taking three or more drugs to lower their blood pressure, in addition to having catnap apnea.
Participants who used the CPAP device for 12 weeks reduced their diastolic blood compression (the bottom calculate in a blood pressure reading) and improved their overall nighttime blood pressure, the researchers found. "The ubiquity of sleep apnea in patients with ungovernable high blood pressure is very high," said result in researcher Dr Miguel-Angel Martinez-Garcia, from the Polytechnic University Hospital in Valencia. "This nap apnea healing increases the probability of recovering the normal nocturnal blood to pattern.
Patients with resistant high blood pressure should undergo a have a zizz study to rule out obstructive sleep apnea, Martinez-Garcia said. "If the pertinacious has sleep apnea, he should be treated with CPAP and subject oneself to blood pressure monitoring". The report, published in the Dec 11, 2013 originate of the Journal of the American Medical Association, was partly funded by Philips-Respironics, maker of the CPAP technique employed in the study.
The CPAP system consists of a motor that pushes divulge through a tube connected to a mask that fits over the patient's entry and nose. The device keeps the airway from closing, and thus allows ceaseless sleep. Sleep apnea is a proverbial disorder. The pauses in breathing that patients familiarity can last from a few seconds to minutes and they can occur 30 times or more an hour.
Saturday, October 27, 2018
What Similarities And Differences Between Sleep, Amnesia And Coma
What Similarities And Differences Between Sleep, Amnesia And Coma.
Doctors can get the idea more about anesthesia, snooze and coma by paying regard to what the three have in common, a fresh report suggests. "This is an effort to try to create a proletarian discussion across the fields," said review co-author Dr Emery N Brown, an anesthesiologist at Massachusetts General Hospital date in karachi. "There is a relation between doze and anesthesia: could this help us get ways to produce new sleeping medications? If we discern how people come out of anesthesia, can it help us help people come out of comas?" The researchers, who compared the manifest signs and brain patterns of those under anesthesia and those who were asleep, promulgate their findings in the Dec 30, 2010 subject of the New England Journal of Medicine.
They acknowledged that anesthesia, rest and coma are very different states in many ways and, in fact, only the deepest stages of log a few zees resemble the lightest stages of anesthesia. And public choose to sleep, for example, but fault into comas involuntarily. But, as Brown puts it, combined anesthesia is "a reversible drug-induced coma," even though physicians espouse to tell patients that they're "going to sleep".
So "They assert 'sleep' because they don't want to scare patients by using the pledge 'coma,'" Brown said. But even anesthesiologists use the term without treaty that it's not quite accurate. "On one level, we positively don't have it clear in our minds from a neurological standpoint what we're doing".
Doctors can get the idea more about anesthesia, snooze and coma by paying regard to what the three have in common, a fresh report suggests. "This is an effort to try to create a proletarian discussion across the fields," said review co-author Dr Emery N Brown, an anesthesiologist at Massachusetts General Hospital date in karachi. "There is a relation between doze and anesthesia: could this help us get ways to produce new sleeping medications? If we discern how people come out of anesthesia, can it help us help people come out of comas?" The researchers, who compared the manifest signs and brain patterns of those under anesthesia and those who were asleep, promulgate their findings in the Dec 30, 2010 subject of the New England Journal of Medicine.
They acknowledged that anesthesia, rest and coma are very different states in many ways and, in fact, only the deepest stages of log a few zees resemble the lightest stages of anesthesia. And public choose to sleep, for example, but fault into comas involuntarily. But, as Brown puts it, combined anesthesia is "a reversible drug-induced coma," even though physicians espouse to tell patients that they're "going to sleep".
So "They assert 'sleep' because they don't want to scare patients by using the pledge 'coma,'" Brown said. But even anesthesiologists use the term without treaty that it's not quite accurate. "On one level, we positively don't have it clear in our minds from a neurological standpoint what we're doing".
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Monday, May 23, 2016
How not to get sick
How not to get sick.
Your coddle as likely as not told you not to discuss politics, sex or religion. Now a psychologist suggests adding people's burden to the record of conversational no-no's during the holidays. Although you might be concerned that a loved one's over-abundance weight poses a health problem, bringing it up will expected cause hurt feelings, said Josh Klapow, an mate professor at the University of Alabama at Birmingham's School of Public Health provillusshop com. "Most ladies and gentlemen know when the scale has gone up.
Instead of pointing out what they may very well know, be a function model," Klapow said in a university flash release. "You can take action by starting to break bread healthy and exercise. Make it about you and let them model your behavior". There are many ways to transmute the holidays healthier for everyone, said Beth Kitchin, second professor of nutrition sciences at UAB.
Your coddle as likely as not told you not to discuss politics, sex or religion. Now a psychologist suggests adding people's burden to the record of conversational no-no's during the holidays. Although you might be concerned that a loved one's over-abundance weight poses a health problem, bringing it up will expected cause hurt feelings, said Josh Klapow, an mate professor at the University of Alabama at Birmingham's School of Public Health provillusshop com. "Most ladies and gentlemen know when the scale has gone up.
Instead of pointing out what they may very well know, be a function model," Klapow said in a university flash release. "You can take action by starting to break bread healthy and exercise. Make it about you and let them model your behavior". There are many ways to transmute the holidays healthier for everyone, said Beth Kitchin, second professor of nutrition sciences at UAB.
Sunday, April 10, 2016
People Depends On Their Biological Clock
People Depends On Their Biological Clock.
The body's biological clock may give West Coast pro football teams an sway over East Coast teams during nightfall games, a creative reflect on suggests. Researchers analyzed more than 100 National Football League games played between 1970 and 2011 that started after 8 PM Eastern stretch and labyrinthine West Coast against East Coast teams try vimax. They compared these to almost 300 daytime games involving the same match-ups.
The West Coast teams had a paramount border over East Coast teams during end of day games, according to the den in the December 2013 outgoing of the journal Sleep. "Over the past 40 years, even after accounting for the characteristic of the teams, West Coast NFL teams have had a significant athletic presentation advantage over East Coast teams when playing games starting after 8 PM Eastern time," pre-eminence founder and sleep medicine physician Dr Roger Smith said in a list news release.
The body's biological clock may give West Coast pro football teams an sway over East Coast teams during nightfall games, a creative reflect on suggests. Researchers analyzed more than 100 National Football League games played between 1970 and 2011 that started after 8 PM Eastern stretch and labyrinthine West Coast against East Coast teams try vimax. They compared these to almost 300 daytime games involving the same match-ups.
The West Coast teams had a paramount border over East Coast teams during end of day games, according to the den in the December 2013 outgoing of the journal Sleep. "Over the past 40 years, even after accounting for the characteristic of the teams, West Coast NFL teams have had a significant athletic presentation advantage over East Coast teams when playing games starting after 8 PM Eastern time," pre-eminence founder and sleep medicine physician Dr Roger Smith said in a list news release.
Wednesday, October 9, 2013
Seasonal Changes In Nature Can Disrupt The Sleep Cycle In Adolescents
Seasonal Changes In Nature Can Disrupt The Sleep Cycle In Adolescents.
When the days blossom longer in the spring, teens event hormonal changes that advantage to later bedtimes and associated problems, such as paucity of beauty sleep and mood changes, researchers have found initial. In a contemplate of 16 students enrolled in the 8th grade at an upstate New York mid school, researchers collected intelligence on the kids' melatonin levels.
Levels of melatonin - a hormone that tells the body when it's nighttime - normally head start rising two to three hours before a child falls asleep. The exploration authors found that melatonin levels in the teens began to mount an average of 20 minutes later in the spring than in the winter.
When the days blossom longer in the spring, teens event hormonal changes that advantage to later bedtimes and associated problems, such as paucity of beauty sleep and mood changes, researchers have found initial. In a contemplate of 16 students enrolled in the 8th grade at an upstate New York mid school, researchers collected intelligence on the kids' melatonin levels.
Levels of melatonin - a hormone that tells the body when it's nighttime - normally head start rising two to three hours before a child falls asleep. The exploration authors found that melatonin levels in the teens began to mount an average of 20 minutes later in the spring than in the winter.
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