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Här är ett bra citat på engelska som förklarar orsakerna till varför man får stånd under nattsömnen...
These erections are called nocturnal penile tumescence (NTP.) and have been studied extensively in the sleep laboratory. All men have them during most of their lives. They occur during the dream cycles of sleep (REM sleep) but everyone has the erections whether they dream or not - so they typically have nothing to do with the content of our dreams. Your body just turns these erections on and off all night for the health of your penis. They keep the penis healthy by maintaining its ability to stretch and contract and by irrigating it with fresh blood. In fact, as the quote below indicates, not having them reveals a problem: "It is normal for a man to have five to six erections during sleep, especially during rapid eye movement (REM), which occurs during the dream segments of sleep. These erections occur about every 90 minutes and last for about 30 minutes. Failure to have these erections may indicate a problem with nerve function or blood supply in the penis."
These erections are called nocturnal penile tumescence (NTP.) and have been studied extensively in the sleep laboratory. All men have them during most of their lives. They occur during the dream cycles of sleep (REM sleep) but everyone has the erections whether they dream or not - so they typically have nothing to do with the content of our dreams. Your body just turns these erections on and off all night for the health of your penis. They keep the penis healthy by maintaining its ability to stretch and contract and by irrigating it with fresh blood. In fact, as the quote below indicates, not having them reveals a problem: "It is normal for a man to have five to six erections during sleep, especially during rapid eye movement (REM), which occurs during the dream segments of sleep. These erections occur about every 90 minutes and last for about 30 minutes. Failure to have these erections may indicate a problem with nerve function or blood supply in the penis."