Effects of artificial dawn on subjective ratings of sleep inertia and dim light melatonin onset

Chronobiology International
Marina C GiménezMarijke C M Gordijn

Abstract

The timing of work and social requirements has a negative impact on performance and well-being of a significant proportion of the population in our modern society due to a phenomenon known as social jetlag. During workdays, in the early morning, late chronotypes, in particular, suffer from a combination of a nonoptimal circadian phase and sleep deprivation. Sleep inertia, a transient period of lowered arousal after awakening, therefore, becomes more severe. In the present home study, the authors tested whether the use of an alarm clock with artificial dawn could reduce complaints of sleep inertia in people having difficulties in waking up early. The authors also examined whether these improvements were accompanied by a shift in the melatonin rhythm. Two studies were performed: Study 1: three conditions (0, 50, and 250 lux) and Study 2: two conditions (0 lux and self-selected dawn-light intensity). Each condition lasted 2 weeks. In both studies, the use of the artificial dawn resulted in a significant reduction of sleep inertia complaints. However, no significant shift in the onset of melatonin was observed after 2 weeks of using the artificial dawn of 250 lux or 50 lux compared to the control condition. A multilevel analysis re...Continue Reading

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Feb 11, 2014·European Journal of Applied Physiology·Andrew ThompsonGreg Atkinson
Nov 26, 2015·Sleep Medicine Reviews·Annette van MaanenFrans J Oort
Nov 17, 2015·Sleep Medicine Clinics·Jonathan S Emens, Helen J Burgess
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Dec 7, 2018·The European Journal of Neuroscience·Giulia ZerbiniMartha Merrow
Nov 7, 2017·Frontiers in Neurology·Sarah L ChellappaChristian Cajochen

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