When I was four, I discovered that I didn't breath through my mouth when I was sleeping (you must realize that back then I didn't know that I could breath through my nose). So every night for the next week or so, when I got into bed I'd close my eyes and hold my breath in a fail attempt to fall asleep. The result: Every night I nearly suffocated myself trying to sleep.
Do not try this at home.
A childhood belief about sleeping

others believed things like this
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- when i was a little kid. i used to think that when u hold ur breath ur heart stops.. LOL :P — Annonymus
- I still hold my breath when I pass by cemetaries because it is impolite to breathe when other people can't.— Crystal
- When i was litle i used to think i only had to breath when i wanted to.— molly
- when i was a kid i used to think farts were another person in my tummy talking and he had bad breath— JOEY
- I used to think that if you held a turd in for more than an hour it would give you bad breath— phil