I use to do this as a child

Besides popping gazillions of brain cells and scaring babysitters that failed to be informed of this disorder by the p-rents, Rhythmic Movement Disorder (Wiki here) is a pretty sweet trait.

So, as a Child, I basically would bang my head repetitively on a pillow to fall asleep. It was really soothing and super creepy. My sister and I did this shiz till we was 10 and could probably still do some banging that at the age of 22. Check out a fellow RMD'er below:

You might be seriously creeped.


Now picture the babysister walking into a room with two small children demonically banging their heads who can't be woken up. Nice.