It’s important to understand your dog’s sleeping habits, as even a dog can get grouchy if he doesn’t get enough sleep. Have you ever been playing with your puppy and he just passes out, well he just can’t help it. He needs his sleep. The temperature in a room will influence how your dog sleeps. So be sure if your dog sleeps inside or outside, that it is a comfortable temperature at all times. Dogs get hot and cold just like people. Source: lovetoknow