Husband, who has a minor heart condition that does make him a bit more tired has been asleep since bedtime last night (10:30pm) including a trip to a park where he stumbled around with his eyes barely open, and wasn't coherent when I spoke to him (thought a tree was DS and completely disoriented). Went to his parents and he was asleep at the table immediately, then made his way over to the garden shed and slumped up against it sleeping like some kind of drunken teen. Took him back home again (I drove as he couldn't even open the car doors properly) and he has been asleep since. I can only rouse him by shaking him repeatedly even though DC are being extremely loud. Disclaimer that he is deaf but he shouldn't be especially tired at the moment, this kind of sleeping seems bizarre though. I have thought about narcolepsy, but it seems very sudden. Happy to be corrected though!