I have my hedgehog, Polly, in a plastic bin-type cage. She's been in it for about 2 months now, but recently she's been escaping in the middle of the night. I have no idea how. There's nothing she can really climb on to get to the top and the cage is solid. We've even checked it over for possible holes and there's nothing. Is there anyway to stop this? Is she just bored or maybe need a bigger cage? I'm just afraid of her getting stepped on in the middle of the nightor even falling down the stairs, if she gets out of the room?