Related Experiment Video

Updated: Aug 15, 2026

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
08:58

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

The neurology of sleep

Todd J Swick1

  • 1School of Medicine, University of Texas-Houston, Houston, TX 77063, USA. tswick@houstonsleepcenter.com

Neurologic Clinics
|October 26, 2005
PubMed

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Sleep-Wake Cycles

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Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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Stages of Sleep

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