hello, Just adopted a 15 week lab a few days ago..just inquiring as to how many hours of sleep a pup should get in a day? some parts of the day, he seems to get quite bitey and excited...I lure him to his crate and he naps for 2 hours. Is this puppy zoomies and normal? Also, what are some good mental stimulators for him? So far all I got is the stuffed Kong and teaching him to sit, lay etc.