Dogs spend a lot of their day lying down, but that doesn’t always mean they’re getting the quality sleep they need.
According to veterinarians, poor or disrupted sleep can quietly affect a dog’s behavior, mood, and overall health. Here’s how owners can tell if their dog is truly well-rested—and when it may be time to worry.
Is Your Dog Getting Quality Sleep or Just Lying Down a Lot?
When a dog is genuinely sleeping, they move through full sleep cycles, explains Dr. Nathaniel Rakestraw, a veterinarian with Telavets.com.
He told Newsweek that during deeper stages of rest, owners may notice small muscle twitches, soft whimpering, or eyes moving beneath closed lids—signs a dog has reached REM sleep.
A dog that’s getting quality rest typically wakes up alert and ready to engage. If a dog sleeps for long stretches but wakes up groggy, disoriented, or slow to respond, that rest may not be restorative.
Excessive daytime sleeping can also be misleading, notes Dr. Wailani Sung, a board-certified veterinary behaviorist and senior director of animal admissions and wellbeing at Joybound People and Pets.
She told Newsweek that because many dogs nap frequently, owners may miss that their dog is heavily sleeping during the day due to poor sleep at night. That fatigue may show up as low energy, reduced interest in walks or play, or even a poor appetite.
How Many Hours of Sleep Do Dogs Actually Need Each Day?
Most adult dogs need around 12 to 14 hours of sleep per day, though the exact amount depends on age, breed, and size, according to Rakestraw.
Puppies and senior dogs often need as much as 18 hours, while larger breeds tend to sleep more than smaller ones. He also points out that dogs rarely sleep in one long stretch, instead spreading their rest out across multiple naps.
Sung adds that research shows dogs sleep about 10.1 hours over a 24-hour period, with 60 to 80 percent of nighttime hours spent sleeping. Rest, she emphasizes, is just as essential for dogs as it is for people.
Common Signs a Dog Isn’t Getting Enough Rest
Yawning, irritability, clumsiness, and slower reactions are some of the most common signs of sleep deprivation, Rakestraw says.
Dogs may also struggle to focus during training or play and seem less interested in activities they typically enjoy. In some cases, overtired dogs may appear more hyper or restless—a response Rakestraw likens to how children can behave when they’re short on sleep.
From a behavioral standpoint, Sung says dogs that aren’t getting enough rest may become more anxious, over-aroused, or easily agitated. Difficulty listening and performing learned cues can also be a clue that a dog isn’t sleeping well.
Can Poor Sleep Affect a Dog’s Behavior or Mood?
Poor sleep can significantly affect both mood and behavior, Rakestraw explains. Sleep plays a key role in emotional regulation and brain function, and a lack of quality rest can lead to increased anxiety, irritability, or even aggression.
Dogs may also become more reactive to noises or unfamiliar people and struggle to learn new commands or control their impulses.
Sung notes that dogs are diurnal and typically adjust their sleep schedules to match their owners’ routines.
Environmental factors such as lights or noise at bedtime can prevent dogs from reaching deeper stages of sleep, which may leave them feeling tired and unfocused the next day.
Biggest Factors That Disrupt a Dog’s Sleep at Home
Noise, inconsistent routines, and uncomfortable sleeping areas are the most common sleep disruptors, according to Rakestraw.
Stress also plays a role, particularly in dogs experiencing separation anxiety or major household changes like a new pet, new baby, or shifting schedules. Pain or underlying medical issues may also interfere with a dog’s ability to settle into deep sleep.
When Should Owners Be Concerned?
If sleep changes last longer than a week or two, Rakestraw says it’s time to consult a veterinarian. Warning signs include excessive sleepiness along with other symptoms, frequent nighttime waking, loud snoring or gasping, or restless pacing in older dogs.
He notes these issues can point to treatable conditions such as pain, cognitive dysfunction, hormonal imbalances, or neurological problems.
Sung agrees that behavioral changes tied to fatigue—including anxiety, poor appetite, low energy, or loss of interest in normal activities—warrant a veterinary conversation.
Both experts stress that sleep should be treated as a vital sign, not an afterthought.
Maintaining a consistent routine, providing a quiet and comfortable sleeping space, and paying attention to changes can make a meaningful difference.
And when something feels off, reaching out to a veterinarian could help uncover a larger issue behind a restless night.
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