My 6 month old puppy sleeps 11-12 hours a night with one short potty break in there. He then goes out in the morning for about an hour, eats, goes back out for about an hour and then comes in for a 2 hour nap. I make him go back out in the afternoon but it isn't too long (about 1-2 hours) and he is ready for another 2 hour nap. I was worried about him at first because he was always so sleepy, but he does play and plays hard when he is awake. He looks healthy and seems very happy so I am not worried anymore.