"Impulses from the brain cause erections during the dreaming phase of sleep, called the REM phase. It doesn't matter if you're having a hot sex dream or a zombie apocalypse nightmare -- your penis gets hard during that period of the sleep cycle.
"...A device like a vacuum pump, which forces the penis to swell with blood, can help men with physical erection problems maintain a healthy penis, Kohler says.
http://men.webmd.com/guide/8-things-you-did-not-know-about-your-penis
"...A device like a vacuum pump, which forces the penis to swell with blood, can help men with physical erection problems maintain a healthy penis, Kohler says.
http://men.webmd.com/guide/8-things-you-did-not-know-about-your-penis





