Circadian rhythm sleep disorder

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Circadian rhythm sleep disorder
Classification and external resources
ICD-9327.3, 780.55
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Circadian rhythm sleep disorder
Classification and external resources
ICD-9327.3, 780.55


Humans, like most animals and plants, have biological rhythms, known as circadian rhythms, which are controlled by a biological clock and work on a daily time scale. These affect body temperature, alertness, appetite, hormone secretion etc. as well as sleep timing. Due to the circadian clock, sleepiness does not continuously increase as time passes. A person's desire and ability to fall asleep is influenced by both the length of time since the person woke from an adequate sleep, and by internal circadian rhythms. Thus, the body is ready for sleep and for wakefulness at different times of the day.


Types of circadian rhythm sleep disorders[edit]

Extrinsic type[edit]


Intrinsic type[edit]


Normal circadian rhythms[edit]

Typical features of a normal cicadian rhythm, including a bedtime of 22:00.



Circadian rhythm abnormalities[edit]


Circadian rhythm abnormalities are also extremely common in ADHD, especially in the form of delayed sleep (sleep initiation insomnia). It has been genetically linked by findings of polymorphism in genes in common between those apparently involved in ADHD and those involved in the circadian rhythm[4][5] and a high proportion of DSPD among those with ADHD,[6][7] however no specific or further cause-effect relationship has been proven.


Treatment for circadian rhythm sleep disorders[edit]

Possible treatments for circadian rhythm sleep disorders include:

See also[edit]


  1. ^ Dagan, Yaron (February 2002). "Circadian rhythm sleep disorders (CRSD)" (Abstract). Sleep Medicine Reviews (Elsevier) 6 (1): 45–54. doi:10.1053/smrv.2001.0190. PMID 12531141. Retrieved 2010-10-13. 
  3. ^ Cataletto, Mary E.; Hertz, Gila (Updated 2005-09-07). "Sleeplessness and Circadian Rhythm Disorder" (Free registration required). eMedicine from WebMD. Retrieved 2008-07-20. 
  6. ^ Van der Heijden KB, Smits MG, Van Someren EJ, Gunning WB (2005). "Idiopathic chronic sleep onset insomnia in attention-deficit/hyperactivity disorder: a circadian rhythm sleep disorder". Chronobiology International 22 (3): 559–70. doi:10.1081/CBI-200062410. PMID 16076654. 
  9. ^ "Sleep Hygiene". Sleep Disorders Australia. 2006. p. 1. Retrieved 2011-12-09. 
  10. ^ "Resetting the Body Clock and Other research and insomniac treatment contacts". Flinders University. 2014. p. 1. Retrieved 2014-01-17. 
  12. ^ The Cleveland Clinic Guide to Sleep Disorders by Nancy Foldvary-Schaefer, DO

External links[edit]