October 9th, 2015

• 10/9/15 12:22 am
• Men have several night-time erections. On average, a healthy man has three to five erections during a full night's sleep, with each erection lasting 25-35 minutes. It's common for men to wake up with an erection, informally called a "morning glory or wood". This is in fact the last in the series of night-time erections.
  
  During the sleep cycle, the extra blood increases oxygenation as it serves as a system of repair and helps to maintain functionality. Morning wood is just a remnant of REM sleep, which is why men wake up to erections
  
  Just like men, the absence of norepinephrine during the REM phase of the sleep causes erections. In women, this phenomenon is called Nocturnal clitoral tumescence while it is called Nocturnal penile tumescence in men. In women, not only the clitoris get engorged with blood but the vagina too.
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