Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol

Leon Lack, Michelle Bailey, Nicole Lovato, Helen WrightSchool of Psychology, Flinders University, Adelaide, South Australia, AustraliaAbstract: Evening chronotypes typically have sleep patterns timed 2&ndash;3 hours later than morning chronotypes. Ambulatory studies have suggested that diffe...

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Autores principales:	Leon Lack, Michelle Bailey, Nicole Lovato, et al
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2009
Materias:	Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
Acceso en línea:	https://doaj.org/article/5fd5cb581a474531b831bac6b768e3d6
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spelling	oai:doaj.org-article:5fd5cb581a474531b831bac6b768e3d62021-12-02T00:46:09ZChronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol1179-1608https://doaj.org/article/5fd5cb581a474531b831bac6b768e3d62009-11-01T00:00:00Zhttp://www.dovepress.com/chronotype-differences-in-circadian-rhythms-of-temperature-melatonin-a-a3695https://doaj.org/toc/1179-1608Leon Lack, Michelle Bailey, Nicole Lovato, Helen WrightSchool of Psychology, Flinders University, Adelaide, South Australia, AustraliaAbstract: Evening chronotypes typically have sleep patterns timed 2&ndash;3 hours later than morning chronotypes. Ambulatory studies have suggested that differences in the timing of underlying circadian rhythms as a cause of the sleep period differences. However, differences in endogenous circadian rhythms are best explored in laboratory protocols such as the constant routine. We used a 27-hour modified constant routine to measure the endogenous core temperature and melatonin circadian rhythms as well as subjective and objective sleepiness from hourly 15-minute sleep opportunities. Ten (8f) morning type individuals were compared with 12 (8f) evening types. All were young, healthy, good sleepers. The typical sleep onset, arising times, circadian phase markers for temperature and melatonin and objective sleepiness were all 2&ndash;3 hours later for the evening types than morning types. However, consistent with past studies the differences for the subjective sleepiness rhythms were much greater (5&ndash;9 hours). Therefore, the present study supports the important role of subjective alertness/sleepiness in determining the sleep period differences between morning and evening types and the possible vulnerability of evening types to delayed sleep phase disorder.Keywords: chronotype, constant routine, circadian rhythms, sleep propensity, subjective sleepiness Leon LackMichelle BaileyNicole Lovatoet alDove Medical PressarticlePsychiatryRC435-571Neurophysiology and neuropsychologyQP351-495ENNature and Science of Sleep, Vol 2009, Iss Default, Pp 1-8 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
spellingShingle	Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495 Leon Lack Michelle Bailey Nicole Lovato et al Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
description	Leon Lack, Michelle Bailey, Nicole Lovato, Helen WrightSchool of Psychology, Flinders University, Adelaide, South Australia, AustraliaAbstract: Evening chronotypes typically have sleep patterns timed 2&ndash;3 hours later than morning chronotypes. Ambulatory studies have suggested that differences in the timing of underlying circadian rhythms as a cause of the sleep period differences. However, differences in endogenous circadian rhythms are best explored in laboratory protocols such as the constant routine. We used a 27-hour modified constant routine to measure the endogenous core temperature and melatonin circadian rhythms as well as subjective and objective sleepiness from hourly 15-minute sleep opportunities. Ten (8f) morning type individuals were compared with 12 (8f) evening types. All were young, healthy, good sleepers. The typical sleep onset, arising times, circadian phase markers for temperature and melatonin and objective sleepiness were all 2&ndash;3 hours later for the evening types than morning types. However, consistent with past studies the differences for the subjective sleepiness rhythms were much greater (5&ndash;9 hours). Therefore, the present study supports the important role of subjective alertness/sleepiness in determining the sleep period differences between morning and evening types and the possible vulnerability of evening types to delayed sleep phase disorder.Keywords: chronotype, constant routine, circadian rhythms, sleep propensity, subjective sleepiness
format	article
author	Leon Lack Michelle Bailey Nicole Lovato et al
author_facet	Leon Lack Michelle Bailey Nicole Lovato et al
author_sort	Leon Lack
title	Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
title_short	Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
title_full	Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
title_fullStr	Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
title_full_unstemmed	Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
title_sort	chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol
publisher	Dove Medical Press
publishDate	2009
url	https://doaj.org/article/5fd5cb581a474531b831bac6b768e3d6
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_version_	1718403498956029952

Chronotype differences in circadian rhythms of temperature, melatonin, and sleepiness as measured in a modified constant routine protocol

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