Science has discovered that there truly are boogeymen hiding under the bed.
Yes, when all the lights are off, and it’s the dark of the night, you are in danger. Generally, you are ok if you keep everything tucked in the bed. Yes, you are secure and protected.
However, as you sleep, unconsciously you do tend to move about a bit. And, as you sleep, you might unwittingly move into a position which makes you get-able. A hand. A foot. Anything accidentally sticking out. Well. The boogeyman’s gonna getcha.