Why do guys get morning wood ?

erection occur during a sleep cycle called REM sleep, it is the period when we dream. blood flows into the penis and you get an erection. most people usually wake up during a REM cycle and often boys have an erection.

All men without physiological erectile dysfunction experience this phenomenon, usually three to five times during the night. It typically happens during REM sleep.

The cause of Morning wood is not known with certainty. Bancroft (2005) hypothesizes that the noradrenergic neurons of the locus ceruleus are inhibitory to penile erection, and that the cessation of their discharge that occurs during REM sleep may allow testosterone-related excitatory actions to manifest as morning

i get wood even at evening morning and all the time..and i cant ask it why so its play time...time dont matter

http://en.wikipedia.org/wiki/Nocturnal_penile_tume...

It's so we don't roll out of bed...

You couldn't google this?

because we have to pee.