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Sleep and circadian rhythmicity as entangled processes serving homeostasis
Paul Franken1, Derk-Jan Dijk2,3
1Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland. paul.franken@unil.ch.
Nature Reviews. Neuroscience
|December 1, 2023
Summary
Sleep regulation involves circadian rhythm and sleep homeostasis, which may not be separate. New research suggests these processes are interconnected, impacting gene expression and recovery dynamics.
Area of Science:
- Neuroscience
- Sleep Science
- Chronobiology
Background:
- Sleep is vital for brain and body function.
- Traditionally, sleep is regulated by separate circadian and homeostatic processes.
- Recent studies challenge this separation.
Purpose of the Study:
- To review and re-evaluate the concept of separate circadian and homeostatic sleep regulation.
- To integrate findings from human and rodent studies.
- To explore the interplay between circadian rhythmicity and sleep homeostasis.
Main Methods:
- Review of recent human and rodent studies on sleep and circadian rhythms.
- Analysis of gene expression patterns in response to sleep perturbations.
- Examination of recovery dynamics across different sleep variables.
Main Results:
- Circadian rhythm gene alterations impact sleep timing and homeostasis markers like electroencephalogram slow-wave activity (SWA).
- Sleep disruptions alter core clock gene expression rhythmicity.
- Recovery from sleep loss shows variable time courses for different sleep metrics and gene expression.
Conclusions:
- Findings challenge the notion of independent circadian and sleep-wake processes.
- Sleep homeostasis dynamics may involve more than single variables.
- Future research should assess multiple sleep and molecular variables over time to understand physiological homeostasis.
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