When my son was about 5 he thought that the light-shade in his bedroon became a laser gun at night and would shoot him if he got out of bed. His favourite cuddly toy was a dog with long ears, and he would go to sleep with one of the dog's ears draped over his eyes so that the light couldn't tell if he was awake.
A childhood belief about under my bed

others believed things like this
- I used to believe that I could make a laser by putting more batteries in a flash light.— Tyler
- I used to believe the ^^ emoticon referred to 2 pointy ears like a cat, instead of closed eyes.Anon
- I, to this day, believe that when I can't sleep at night it means I'm awake in someone else's dreams... — Turner
- I always thought the song Blinded by the light went "Wrapped up like a dousche, another runner in the night"— Dawn
- I used to think that if you shone a flashlight beam onto a lightbulb long enough, it would eventually light.— Karen K
- From a misunderstanding, I thought everyone’s ears were the same size.— Enrico