Cited by 74Sleep and related disordersCircadian rhythm and melatoninSleep and Work-Related Fatigue

Treating chronobiological components of chronic insomnia

Lack, Leon C., Wright, Helen R.·2007·Sleep Medicine

Abstract

Circadian rhythms have a strong effect on the ability to sleep across the 24-h period. Maximum sleepiness occurs at the phase of lower endogenous core body temperature. This period is bracketed by two periods of alertness: a "wake-maintenance zone" occurring 6-10h before the time of core temperature minimum, and a "wake-up zone" occurring 4-7h after the minimum. Therefore, if the circadian rhythm drifts earlier with respect to the attempted sleep period, the wake-up zone can impinge on the end of the normal sleep period resulting in premature awakening and the development of early morning awakening insomnia. Similarly, a delay of the circadian rhythm can impose the wake-maintenance zone on the attempted bedtime and lead to sleep onset insomnia. Therefore, these two types of insomnia should be treatable with chronobiologic effects such as bright light and, possibly, melatonin administration. Bright light stimulation at normal wake-up time and melatonin administration 4-8h before normal bedtime can phase advance circadian rhythms to an earlier time. While morning bright light has been efficacious for sleep onset insomnia, evening melatonin administration has yet to be tested. Early morning awakening insomnia has been treated with phase delays imposed by evening bright light but not yet with morning melatonin administration. There is now sufficient evidence to warrant the consideration of chronobiologic manipulations such as bright light therapy for the treatment of chronic sleep onset and early morning awakening insomnia that show evidence of circadian delay or advance, respectively.

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Crossref · 10.1016/j.sleep.2006.10.003

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Authors
Lack, L. C., & Wright, H. R.
Affiliations
Flinders University (AU)
Corresponding author
Lack, Leon C.
Venue
Sleep Medicine
Publisher
Elsevier BV
Published
2007-09
Volume
8
Issue
6
Pages
637-644
ISSN
1389-9457 (ISSN-L)
OpenAlex
W2135493222
Cited by
74
References
65
Citations by year
2025: 3 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 3 · 2017: 4 · 2016: 9 · 2015: 5 · 2014: 4 · 2013: 5 · 2012: 3
FWCI
6.42
Type
journal article
Language
en
Open access
closed
Locations
  • Sleep Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Flinders Academic Commons (Flinders University) (submittedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
Keywords
chronic insomnia, circadian rhythm, chronobiology, sleep onset insomnia, bright light therapy, melatonin, core body temperature, circadian phase advance, circadian phase delay
MeSH terms
Behavior Therapy, Biological Clocks, Body Temperature, Chronic Disease, Circadian Rhythm, Humans, Light, Melatonin, Phototherapy, Chronotherapy, Sleep Disorders, Circadian Rhythm

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