Jove
Visualize
Contact Us

Related Experiment Videos

The human circadian system in normal and disordered sleep.

Gary S Richardson1

  • 1Division of Sleep Medicine, Henry Ford Hospital, Detroit, MI 48202, USA. grichar1@hfhs.org

The Journal of Clinical Psychiatry
|December 13, 2005
PubMed
Summary

The human circadian system, regulated by the suprachiasmatic nuclei (SCN), governs sleep-wake cycles. Disruptions to this biological clock can cause sleep disorders like jet lag and insomnia.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Epidemiology of insomnia and the need for diagnosis and treatment.

Postgraduate medicine·2009
Same author

Safety and subjective sleep effects of ramelteon administration in adults and older adults with chronic primary insomnia: a 1-year, open-label study.

The Journal of clinical psychiatry·2009
Same author

Circadian phase-shifting effects of repeated ramelteon administration in healthy adults.

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine·2008
Same author

Human physiological models of insomnia.

Sleep medicine·2008
Same author

Circadian rhythmicity and the pharmacologic management of insomnia.

The American journal of managed care·2007
Same author

Long-term use of sedative hypnotics in older patients with insomnia.

Sleep medicine·2005
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Area of Science:

  • Neuroscience
  • Chronobiology
  • Sleep Medicine

Background:

  • The human circadian system, centered on the suprachiasmatic nuclei (SCN), dictates physiological rhythms and sleep-wake patterns.
  • Light exposure is crucial for synchronizing the intrinsic circadian cycle, which is slightly longer than 24 hours, to the Earth's daily cycle.
  • Circadian rhythmicity originates from protein transcription within SCN neurons.

Purpose of the Study:

  • To elucidate the role of the circadian system in regulating normal sleep and wake phases.
  • To explore the connection between circadian system dysfunction and sleep disorders.
  • To investigate the potential link between circadian abnormalities and common sleep disorders like insomnia.

Main Methods:

  • Review of the physiological mechanisms underlying the human circadian system.
  • Analysis of the components of the circadian system, including the SCN, pineal gland, retina, and retinohypothalamic tract.
  • Examination of the impact of light on circadian entrainment.

Main Results:

  • The SCN acts as the primary biological clock, generating circadian rhythms through protein transcription.
  • Circadian rhythm sleep disorders, such as jet lag and shift work disorder, result from circadian system dysfunctions.
  • Evidence suggests a strong association between circadian system abnormalities and other sleep disorders, including insomnia.

Conclusions:

  • The circadian system is fundamental to the sleep-wake cycle.
  • Dysfunctions in the circadian system are directly linked to specific circadian rhythm sleep disorders.
  • Abnormalities in the circadian system are likely implicated in a broader range of sleep disorders, including insomnia.

Related Experiment Videos