Well, I'd say it more or less depends on individual pups. One minute you see them frolicking and the next they are fast asleep. But one time my Boeing went 15 hrs straight w/o a single nap during the day. That was back when he was just a three-month-old pup. Oh, boy! That was one of the most tiring days of my life :doh: But night time has always been very peaceful ever since he was young as he sleeps 7-8 hrs straight.