Yup! I've done that quite a bit. I try to cover it most of the time because a couple times when it was uncovered and I got up in the middle of the night I spooked him by accident and he freaked out.

But yeah, if he's covered, he'll be very very quiet until I wake up, turn music on, uncover his cage, etc. He's very polite in that way.

Rivers, ponds, lakes and streams - they all have different names, but they all contain water. Just as religions do - they all contain truths - Muhammad Ali