He may be struggling with tactile hypersensitivity. Has he had any speech or occupation therapy assessment ? The injured brain can have the strangest responses to the various senses. Years ago, I needed to wear chenille gloves to help with the tactile sensations that prevented me from sleeping.

He needs some sort of activity to stimulate a minimum level of blood flow through his brain. Do you have access to a stationary bike or floor pedal exerciser ? He needs to get some exercise but stay below his head ache threshold.