As child, did you ever go to bed and once in a while get the ebe jeebies about some kind of horrific monster which might be lurking underneath the bed? I did on occasion and can remember trying make sure i didn't hang my foot or an arm out of the side in case it grabbed me. I was also too scared to look in case it really was there! Sad or wot!
I do remember, in recent years, seeing a cartoon in book depicting a terrified child, in bed, rigid with fear and sweating because there, underneath his bed was a real hairy monster with huge knashers, waiting for the moment his arm or leg hung out the side. It made me smile for a long time afterwards.