When I slept when I was young, I used to believe that you enter a completley alternate universe, and if you focus enough, you can get stuck in your dreams until you feel like leaving.
A childhood belief about sleeping

others believed things like this
- I thought the song Shattered Dreams was acutaly "Shadow Dreams" and wondered what shadow dreams were— Golgademon
- i thought split personalities were like having dreams. the dreams i had were all my personalities!— Odd Dreamer
- I used to believe that at the end of the universe was a big plywood wall.— matt
- I used to believe Sting was my dad in a parallel universe — Jenn Green
- I used to believe that twenty was the largest number in the universe.— Bernardo Fernandez
- Well,I really think that fairies and witches can be real! We're in a big universe and they can exist!— Raul