Reason why men get erection every morning

It happens to little boys, teenagers and grown men- the ability to pitch a tent in the morning without any camping skills.

we're referring to Nocturnal Penile Tumescence (NPT),which is also know as a morning wood or  erections.
Here's everything you need to know about this phenomenon.
they occur in the shallow part of the sleep cycle. erections are  part of the normal sleep cycle multiple times during the night. the body gradually goes through different stages of sleep, from Non-REM sleeping too deep. this cycle occurs 4-5 times in the night. as you enter REM sleep, you not only dream, but your body also goes through some physiological changes.