Most men have erections every hour to hour and a half during sleep. The combination of blood circulation and testosterone production can cause erections during sleep and they're often a normal and necessary part of REM sleep.
 | Be Your Own Life Coach |
 | It's Not How You Start That Matters, It's How You Finish |
 | How Running Can Relieve Pain |
 | 8 Common Worries That Aren't Worth Stressing About |
