Sleep Apnea Support Group
Sleep apnea is a common sleep disorder characterized by brief interruptions of breathing during sleep. People with sleep apnea partially awaken as they struggle to breathe, but in the morning they may not be aware of sleep disturbances.

I suggest you put a cot for yourself in the bedroom and if he can tolerate any noise from that distance, keep moving the cot closer. Sort of sneak up on him. Worth a try...