Cookie the Hamster

Cookie the hamster sleeps all day long and plays all night. The girls are frustrated because he is NEVER awake during the day! I hear him in there at night moving things around in his cage. And sometimes when I check on him he is hanging upside down from the top of his cage. Silly hamster. I need to get him a wheel to run on. He is so friendly and begs for you to get him out of the cage when he is awake.