I wouldn't worry too much. Nikko is 8 months old and I can pretty much bet he is at home sleeping the day away, all day. I am not as lucky as you (I wish I were) and I can't bring my pup to work with me, so he stays at home alone. i keep him in the kitchen with food, water, toys, etc. I know he sleeps all day because when I am home he does it. they are just lazy little things,