Evening daylight may cause adolescents to sleep less in spring than in winter.

Chronobiology International
Mariana G Figueiro, Mark S Rea

Abstract

Sleep restriction commonly experienced by adolescents can stem from a slower increase in sleep pressure by the homeostatic processes and from phase delays of the circadian system. With regard to the latter potential cause, the authors hypothesized that because there is more natural evening light during the spring than winter, a sample of adolescent students would be more phase delayed in spring than in winter, would have later sleep onset times, and because of fixed school schedules would have shorter sleep durations. Sixteen eighth-grade subjects were recruited for the study. The authors collected sleep logs and saliva samples to determine their dim light melatonin onset (DLMO), a well-established circadian marker. Actual circadian light exposures experienced by a subset of 12 subjects over the course of 7 days in winter and in spring using a personal, head-worn, circadian light measurement device are also reported here. Results showed that this sample of adolescents was exposed to significantly more circadian light in spring than in winter, especially during the evening hours when light exposure would likely delay circadian phase. Consistent with the light data, DLMO and sleep onset times were significantly more delayed, and ...Continue Reading

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Citations

Jan 12, 2011·Journal of Circadian Rhythms·Tomoaki KozakiAkira Yasukouchi
Jun 29, 2012·Journal of Physiological Anthropology·Jim WaterhouseTakeshi Morita
Nov 15, 2011·Chronobiology International·R Robert AugerNancy L Slocumb
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Jan 5, 2012·Chronobiology International·Christian VollmerChristoph Randler
Jul 25, 2012·Chronobiology International·Gloria GelbmannCiçek Wöber-Bingöl
May 5, 2011·Chronobiology International·Orna Tzischinsky, Tamar Shochat
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Dec 2, 2020·Journal of Sleep Research·Benjamin McManusDespina Stavrinos

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