I used to think that when you were an adult you never slept because as you got older you got to stay up later and later, so i thought that eventually you just didn't sleep.
A childhood belief about getting older

others believed things like this
- 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.— Lara
- I used to only sleep on my back because I thought I would break my ribs if I slept on my stomach.— Molly
- When I was a kid, I slept with my fists balled up because I thought if I didn't, E.T. would eat my fingers. — Brian
- I used to believe that if you didn't go to sleep, the sun would never come up.— terri
- When I was ten, I used to believe that the horses didn't sleep.— Jared
- When I was a child, I thought that grown-ups were adult.— Gloria