Father keeps falling asleep while sitting all of the sudden hes not even aware. can this be fatal? doctor told him he can choke with snoring.

Yes: A cause of death could be due to falling asleep while driving or using machinery (such as causing a multi-fatality wreck), so a person who suddenly falls asleep during the daytime must stop driving now. The evaluation usually includes a sleep study (an overnight study) to see what the problem is. Snoring is an obstruction the prevents normal sleeping and may prevent adequate oxygen to the brain.