I let my rat, Remi, free range around my bedroom for playtime. He's normally very well behaved, but lately he's been chewing the wooden supports that hold my bed mattress. It's something new, so could it be boredom? I don't want to bloc the underneath of my bed off because it's his favorite place in my room and he loves to stash paper and stuff in there. So is there any way to stop his behavior?