Never had middle-of-the-night sex. So no experience there for ya.
Once in a blue moon....and I mean really rare....we might have morning sex. Like if we happen to wake up on a Saturday and he doesn't have to be to work for a while and our kid is miraculously sleeping in and the dog miraculously doesn't have to pee...then MAYBE it'll happen.
and if the stars are so aligned...bad breath is the last thing on my mind. Honestly, I don't think ours is too bad. Hm..I dunno.
Maybe keep some breath mints or spray in your 'naughty' drawer...