microsleep, I believe I've experienced that a few times. In lectures haha. High probability of it happening if I sleep for 3-4 hours for 3+ consecutive nights. I would just look at the lecturer and everything would seem fine, the next thing I know, I'm opening my eyes haha I actually don't realize it at all and yes it is not easy trying to stop yourself from doing it. It'll just happen again without you knowing it

so late night drivers, make sure you have enough sleep. You don't wanna open your eyes to glass shatters