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LIGHT OVERNIGHT REDUCES THE PRODUCTION OF MELATONIN ADOLESCENTS

August 31, 2015 (Usa)
 

Even a "point of light" held on overnight not only delays the time to fall asleep but in young adolescents also reduces the production of melatonin. This was revealed in a new study published in the Journal of Clinical Endocrinology & Metabolism. The biology of sleep boys aged between 9 and 15 years is therefore more affected by the light than boys aged 11 and 16 years.
Among the 38 young adolescents (9-15 years) controlled, one hour of exposure to light of 15 lux (like a point light) reduced melatonin production by 9.2%; a light of 150 lux (type normally lit room) it has reduced by 26%; Finally a light of 500 lux (supermarket type) reduced it by 36.9%. In the 29 older children (11-16 years) surveyed, these data were respectively 0% (15 lx); 12.5% (150 lx); 23.9% (500 lx).
"Small amounts of light during the night, such as screens, can be enough to affect sleep," says study author Mary Carskadon, rofessor of psychiatry and human behavior in the Alpert Medical School of Brown University (Usa) and director of chronobiology and sleep research at the E.P. Bradley Hospital in East Providence, RI. "Students who have tablet, TV or computer, even a flashlight 'old school' under the covers to read, are pushing their circadian clocks to a more delayed timing. This makes it difficult to go to sleep and wake up the next morning to go to school "(Source: http://www.sleepreviewmag.com)

 
31 Agosto 2015
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