• Source: Sleep inversion

Sleep inversion or sleep-wake inversion is a reversal of sleeping tendencies. Individuals experiencing sleep-wake inversion exchange diurnal habits for nocturnal habits, meaning they are active at night and sleep during the day. Sleep-wake inversion, when involuntary, can be a sign of a serious disorder.




Presentation



Individuals with the delayed sleep phase type of the disorder exhibit habitually late sleep hours and an inability to change their sleeping schedule consistently. They often show sleepiness during the desired wake period of their days. Their actual phase of sleep is normal. Once they fall asleep, they stay asleep for a normal period of time, albeit a period of time that starts and stops at an abnormally late time.




Causes


Sleep inversion may be a symptom of elevated blood ammonia levels and is often an early symptom of hepatic encephalopathy. Sleep inversion is a feature of African trypanosomiasis, after which the disease takes its common name, "African sleeping sickness"; sleep-wake cycle disturbances are the most common indication that the disease has reached the stage where infection spreads into the central nervous system.




See also


Jet lag
Shift work sleep disorder
Circadian rhythm
Delayed sleep phase disorder
Encephalitis lethargica
Lethargy




References






Further reading


Diagnostic and Statistical Manual of Mental Disorders (4th text revised ed.). Washington, DC: American Psychiatric Association. 2000.
Buysse DJ, Morin CM, Reynolds CF (1995). "Sleep Disorders". In Gabbard GO (ed.). Treatments of Psychiatric Disorders (2nd ed.). Washington, DC: American Psychiatric Press.
Hobson JA, Silvestri R (1999). "Sleep and Its Disorders". In Nicholi AM Jr (ed.). The Harvard Guide to Psychiatry. Cambridge, MA: Belknap Press of Harvard University Press.
"Sleep-wake inversion (Concept Id: C0338497)". MedGen. NCBI. NIH. Retrieved 2 August 2024.
Thorpy MJ, Yager J (2001). The Encyclopedia of Sleep and Sleep Disorders (2nd ed.). New York: Facts on File.




External links


American Sleep Disorders Association

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