The floor makes a lot of sense to me. You're churning a ton of extra electrochemical energy when psychotic. By sleeping on the floor you're essentially grounding yourself the same way your house does in a lightning storm except the lightning is pulsing through your body.

Your thoughts generate electric pulses that move in transverse waves like light and lightning travel. Your emotions generate chemical waves that move like sound waves the same way thunder travels. They move through you and out of your body. Grounding helps siphon off the excess.

You can also... Hug a tree. Sit at the base of a tree. Walk barefoot in the grass. Put your hands in the dirt. Eat earthy foods that grow in the ground like beets and potatoes. Get some sand and place it in a bucket or tray and play with it. Play with a rock collection. Etc...