I have my 4 leucs in a critter keeper in my room. I'm a night owl, myself. The leucs always sleep until about 2 AM, and then wake up and start hopping around as soon as I'm ready for bed. They must think that the days somehow got a lot shorter, what with two light/dark periods every 24 hours. Should I throw a towel over it to block out the light, or should I not worry about it?