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Nocturnal penile tumescence
Nocturnal penile tumescence (abbreviated as NPT), also known colloquially as morning wood, is a spontaneous erection of the penis during sleep or when waking up. All men without physiological erectile dysfunction experience nocturnal penile tumescence, usually three to five times during the night, typically during REM sleep. NPTs are believed to contribute to penile health.〔(Why guys rise and, well, rise in the morning? ), The Body Odd, NBC News, October 2010〕
==Diagnostic value==
The existence and predictability of nocturnal tumescence is used by sexual health practitioners to ascertain whether a given case of erectile dysfunction (E.D.) is psychological or physiological in origin. A patient presenting E.D. is fitted with an elastic device to wear around their penis during sleep; the device detects changes in girth and relays the information to a computer for later analysis. If nocturnal tumescence is detected, then the E.D. is presumed to be due to a psychosomatic illness such as sexual anxiety; if not, then it is presumed to be due to a physiological cause.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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