A childhood belief about under my bed

I saw a Sherlock Holmes movie which had people being killed by a pigmy who climbed up the drainpipe outside their rooms and shot them with a poison dart from a blowgun. I was convinced that the pigmy would eventually find his way to kill me but I could protect myself if I slept with lots of blankets because the dart would not be able to penetrate through the blankets and into my skin. To this day, while I no longer believe the evil pigmy is after me, I cannot sleep without many blankets even in the middle of summer.