A Rottweiler puppy will sleep between 16 and 22 hours a day, while an adult Rottie will sleep between 13 and 18 hours a day. Snoozing, dozing, and napping is also included in these numbers. Sometimes, a nap can be as short as 10 minutes or as long as one hour. If your dog is well trained, he will sleep throughout the night or when you go to bed. When awake, both the puppy and the adult Rottie will be active and full of energy. These dogs require a good amount of physical exercise to tire them out, which also helps them sleep better.