After my cat is finished doing her business in her litterbox she sits in there and scratches on the sides and top of the box for a while (and when she wakes me up at 3am doing it, it seems like HOURS). I tried glueing carpeting to the inside of the lid so it wasn't so noisy but it just fell off after a few days. If my appartment was big enough, i'd just move the box out of earshot, but unfortunately that's not an option at the moment. Why does she do that and is there anything I can do to get her to stop it?