@darelord A "few minutes". I don't think it's supposed to mean that she fell asleep while being stuck there, but that... trying to cross the drain is the first thing she did in the morning? I'm not entirely certain.
@Gian "After waking up, I found myself unable to do anything..." Maybe she became unconscious after falling . well I don't know for sure. Well few minute in helpless condition fell pretty long time.