I'm always a bit puzzled that this needs to be pointed out? I don't have sleep apnea per se, at least not chronically, but I've definitely had bouts of it due to allergy, sickness, stuff like that. The symptoms are the same because the mechanism is the same: I didn't get enough oxygen in the night.
It's always glaringly obvious to me the next day. I feel way more tired and exhausted than I normally would given the amount of sleep. I sometimes had instances of waking up gasping for air.
I really don't need to be told in those instances that there was an issue during the night. My sleep didn't sleep, of course there's something wrong and needs to be looked at?
Like, one time's a fluke, but if it happens a lot...