Leo: Premise: "A girl seated at a desk in a library lays her head down on a book."
Hypothesis: "A girl studied so long she fell asleep in her book."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
Girl laying her head down on a book does not imply she fell asleep.
Thus, the answer is it is not possible to tell.