It’s not like a broken bone, though - instead, the blood vessels within the penis burst, causing painful swelling.

But many medical professionals say that it’s completely normal. It’s not completely understood why this happens. People with penises may have 3-5 erections per nightĪ person with a penis typically has 3-5 erections per night during rapid eye movement (REM) sleep. Here are a few facts about erections that could be useful to know. If you’re a person with a penis, you may be wondering if the erections (or lack of erections) you’re experiencing are typical.

These facts about erections may or may not surprise you, but they certainly are interesting.