Until I was about 6 years old I thought that when people sleep their heart stops beating and they don't breathe. So everytime I wanted my dad to carry me to bed I would tightly close my eyes, hold my breath and just hope that dad doesn't check my pulse... I always wondered how my dad guessed I wasn't sleeping without checking it, though...
A childhood belief about sleeping

others believed things like this
- 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
- Apparently from seeing EKG's on TV, my daughter believes people die when their heart stops "beeping."— Jager
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- I still believe that if I really concentrate, I can stop my heart from beating.— Patrick
- When I was five or six, I was worried that I'd lost my heart because I didn't hear it beating.Anon