Is it bad that when my roommate sleeps, I'm going to delete his essay?
That's not nice! Why do you want to delete his work?
I don't want him to get on my nerves
Deleting your room mates work is not okay. They'll be angry when they find out what you did. They'll get a poor grade when they don't have a complete assignment to turn in.
He didn't even proof read it! He's going to get a horrible grade anyway.
Even if he gets a bad grade on the paper, he still worked hard on the paper and did the work. Why not be the better person and offer to proof read the paper for him.