A childhood belief about under my bed

When I was about two years old, I no longer slept in a crib, but on the bottom bunk of a wooden bunk bed my parents got me. I saw two "faces" in the wood, on opposite sides of the bed. One was good, the other (who I named Dun-dun, as I still remember) was evil. I also used to wake up in the middle of the night, and since it was dark, I couldn't see which was the open side of the bed (there was solid wood at the head and foot, and one side was against the wall). Feeling every side but the open side, I screamed, thinking the bed had closed up and sealed me inside.