So very tired, they couldn't even take the time to spell "drowsy" right.
So sleepy, said person seems to be on another plane of existence.
A drowzy person may seem to speak in riddles, or get rather distant or
melodramatic about their own lethargy. In worst cases, a drowzy person may act like a total zombie, or lie
on the ground,
pretending to be dead, like an opossum.