I also had the "cover-your-neck-with-the-blanket-to-ward-off-monsters" belief, but as an added twist I also had to keep my arms under the pillow at all times so they wouldn't be chewed by the wolves and crocodiles that prowled my room at night.
A childhood belief about under my bed

others believed things like this
- I use to cover my head at night because I thought monsters would give me a bad hair cut while I was sleeping!— Amy
- I used to believe that monsters couldnt find me or hurt me if my whole body where under my blanket— Scared shitless
- Wolves lived under my bed when I was a kid.— ricolarno
- I used to believe that foxes crawl like crocodiles!— Viktor
- I used to believe that crocodiles were green because they were uncooked— The Ice Cream Sandwich Monster
- My uncle told me if you twist your bellybutton, your bum will fall off, I was terrified!— little2ft