Only due to being really over-tired, never due to boredom or questionable filmmaking. I used to work 6am shifts five days a week and 8am the other two, so sometimes night-time movie watching was tougher than I would've liked.
From what I can recall, I zonked out during The Prince of Egypt, The Wild Bunch and Ironweed. However, after snapping to, I rewound them to the point of where I blanked and rewatched, so as not to miss anything.
*All were at home. I can't imagine falling asleep in a theatre. Although my friend's mom did during Star Trek: The Motion Picture. I can understand that one, though.