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Association of nocturnal erections with REM sleep
Association of nocturnal erections with REM sleep
Penile tumescence during the different stages of sleep. Nocturnal erections occurred during periods of REM sleep (columns).
REM: rapid eye movement.
Data from: Karacan I, Williams RL, Thornby JI, Salis PJ. Sleep-related penile tumescence as a function of age. Am J Psychiatry 1975; 132:932.
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