Sleep deficits in the High Arctic summer in relation to light exposure and behaviour: use of melatonin as a countermeasure

Sleep Medicine
Michel A PaulJosephine Arendt

Abstract

There are conflicting reports regarding seasonal sleep difficulties in polar regions. Herein we report differences in actigraphic sleep measures between two summer trials (collected at Canadian Forces Station Alert, 82.5°N, in 2012 and 2014) and evaluate exogenous melatonin for preventing/treating circadian phase delay due to nocturnal light exposure. Subjects wore actigraphs continuously to obtain sleep data. Following seven days of actigraphic recording the subjects filled out questionnaires regarding sleep difficulty and psychosocial parameters and subsequently remained in dim light conditions for 24 hours, during which saliva was collected bihourly to measure melatonin. During Trial 2, individuals who reported difficulty sleeping were prescribed melatonin, and a second saliva collection was conducted to evaluate the effect of melatonin on the circadian system. Trial 1 subjects collectively had late dim light melatonin onsets and difficulty sleeping; however, the Trial 2 subjects had normally timed melatonin rhythms, and obtained a good quantity of high-quality sleep. Nocturnal light exposure was significantly different between the trials, with Trial 1 subjects exposed to significantly more light between 2200 and 0200h. Mela...Continue Reading

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Citations

Sep 1, 2008·Sleep Medicine Clinics·Bradley F Boeve
Nov 21, 2017·Developmental Psychobiology·Belinda N MandrellValerie McLaughlin Crabtree
Oct 28, 2019·Journal of Circadian Rhythms·Kamila WeissováJana Kopřivová
Nov 30, 2018·Clocks & Sleep·Arne LowdenClaudia R Moreno
May 4, 2017·Sleep Medicine Reviews·Nathalie PattynOlivier Mairesse

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