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.

Count the time between his breaths. The longer between breaths, the more likely he is to have sleep apnea.
Does he snore?
Thanks for the replies!
make a tape recording of him asleep and see doctor about getting him a sleep study