The sleeping habits of puppies vary with breed, size and daily activities. Very young, newborn puppies sleep nearly all the time, approximately 90 percent of the day, according to DailyPuppy.com.
When they are about three months old, puppies begin to need less sleep than newborns, requiring approximately 15 to 20 hours a day. Adequate sleep is vital to developing puppies, who expend a lot of energy when they are awake. In contrast, adult dogs spend about 14 hours a day sleeping; some larger breeds such as mastiffs exceed that amount.
It’s important to teach a puppy sleep routines, states Vetinfo.com. Because some puppies overexert and play until they are exhausted, they tend to fall asleep wherever they are. Establishing bedtime rituals helps a puppy learn to sleep through the night and may improve the quality of sleep by reducing howling and crying.