I have 2 7 month old cats. I got them at 3 weeks old. They were abandoned under someone's shed. Since having them neutered and spayed they run around my house like crazy for about a half hour every couple of hours. THis is fine except at 2am. Is there anyway to get my cats to calm down at night and sleep instead of tearing through my apartment all night? This is becoming a problem with my downstairs neighbors also