I used to believed that when I went to sleep my heart took a rest too, and didn't pump at all while I slept.
A childhood belief about sleeping

others believed things like this
- I used to only sleep on my back because I thought I would break my ribs if I slept on my stomach.— Molly
- I'm deaf in one ear. Until I was 7 I believed that if I didn't sleep on my good ear, dinosaurs would eat me.Anon
- My sister used to think that there was an oil well under every gas station that led directly to the gas pump.Anon
- I used to use the basketball pump in the air because I thought I was donating fresh air to the needy.— Emily
- The song called heart of glass mixed me up as a kid. I heard "Heart and ass". — oops
- I used to think that when people had heart attacks someone came and stabbed their heartAnon