[You know, stationary sleepers are so not in these days. The table isn't very comfortable anyway, so Shinwoo is going to shift around a bit in order to find that perfect place where his body won't complain. However, in doing so, he manages to smack the pile of books to his left and cause the uppermost three to go toppling to the floor.
The sound of book hitting ground is enough to startle him out of sleep.]