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Section of Psychopharmacology and Sleep Research

The processes underlying sleep regulation

This figure shows the homeostatic, circadian
and ultradian processes underlying sleep regulation.

W: Waking
S: Sleeping
N: NonREM sleep
R: REM sleep

(See Glossary)

GIF, 4K

Last update: 07. 06. 2000, Webmaster / Institute of Pharmacology and Toxicology