Nap Time Mischief

Ethan has been fighting his nap the last couple days, and I heard a strange noise a few minutes ago, so I peeked in his room. This is what I found . . .

He threw his mattress and blankets out of the crib and was stomping on the wood base. His poor penguin was also a casualty.

Now I'm worried he'll figure out that he can bunch the mattress up in the crib and use it as a stool to get out. Maybe there's a way to tie the mattress down to the crib - there are holes in the base board, so that might work if he keeps doing this.