can a sleep disorder also cause extreme sensitivity to alcohol?

[Cmll1808]

First off, let me start by saying that as far as I know, my husband does not have a drinking problem so alcoholism is not my concern with these symptoms. My husband since I've known him for 8 years has very weird sleeping issues.  He has fallen asleep at the wheel before. His personality will literally switch in a matter of seconds from totally normal to extreme drowsiness and personality changes to the point where he seems drunk and slurring his words (but has not been drinking). Most of the time at night he falls asleep at his desk(he typically does freelance work on his computer at night) instead of bed. He is very difficult to wake up and more often than not, when he is woken up he doesn't seem fully there, is talking in gibberish, or can't seem to fully grasp what is going on and eyes seem glazed over. He snores very loudly and I have thought he has sleep apnea like his parents. He also has said there is no register in his brain that he needs to go to bed. One second he is awake, the next he is asleep. His day job is not effected so this doesn't seem to be as much of an issue during the day, though I do randomly see symptoms in the middle of the day, especially while droving.

He also shows high sensitivity to alcohol. His sleepy drunk and alcohol drunk are very similar.  After sometimes only a few drinks he will all of a sudden get very sensitive, not fully there, eyes glazed, slurred words  and stumbling. It literally happens in seconds and I can tell instantly in his face and eyes that something is off. We are both average drinkers and this happens often when most people have had more than him and aren't feeling effects.

He often has headaches (though doesn't complain about it much anymore) and I see him taking ibuprofen or aspirin very often at night. He had an mei when he was younger due to his headaches but nothing showed up.

I have thought this may be a sleep disorder issue but I'm getting very concerned especially thinking about having children. any thoughts on what this may be would be so helpful.