Artie sleeps from 11 pm. to 6:30 am. but takes alot of naps, especially when I'm on Yorkie Talk! But when he wakes up for what ever reason? Usually to go to the potty or pooh.....he jumps on our bed and licks our faces to wake us up, so who ever did the last walk can sleep in. We usually take turns. I think he doesn't sleep enough? He is skinny as a rail.