The time itself is not as important as creating a ritual around bedtime. It does not matter when you sleep, but you need to set a proper bedtime schedule for your pup. The AKC recommends putting your pup to sleep at the scheduled time every day. Though there is no right time for your pup to sleep unless it becomes a routine, make sure your pup sleeps for at least 8 hours every night. It is better to set its bedtime routine and make your pup sleep before you so you wake up at the same time.