Abstract
The sleep cycle alternates between REM and NREM sleep, but the mechanisms by which this cycle is generated are totally unknown. We found that a periodic transient increase of the dopamine level in the amygdala during NREM sleep terminates NREM sleep and initiates REM sleep. This mechanism also plays a role in cataplectic attack, which is a pathological intrusion of REM sleep into wakefulness in narcoleptics.
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