Why do Cats and Dogs Sleep So Much: An Investigation

It’s no secret that cats and dogs love their sleep. In fact, they can spend up to 16-20 hours a day sleeping. But why do they need so much sleep? What triggers their urge to snooze? And is there anything we can do to help our furry friends get the restorative rest they need? Let’s take a deeper dive into this topic and find out.

The Science of Sleep

Sleep is essential for all living creatures. It helps to restore and repair the body, aid in the formation of memories, and regulate important bodily functions. The amount of sleep required varies between different species and individuals, but as a general rule, larger animals tend to need more sleep than smaller ones.

When it comes to cats and dogs, their sleep patterns are governed by their circadian rhythms. This internal biological clock is regulated by the hypothalamus, a part of the brain that controls various bodily functions including sleep and wakefulness. Unlike humans, who are diurnal (meaning they are active during the day and sleep at night), dogs and cats are crepuscular (active at dawn and dusk).

This means that they are naturally inclined to take naps and rests throughout the day to conserve energy for their active periods at dawn and dusk, and to keep their senses sharp for hunting and scavenging.

The Sleep Cycle

Dogs and cats have a similar sleep cycle to humans, with two distinct stages: rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. During the REM stage, the muscles become more relaxed, and voluntary movements, like eye movements, occur. The NREM stage is characterized by a slower heart rate, lower blood pressure, and overall relaxation of the body. This is when most of the restorative functions of sleep take place, including tissue repair and the release of growth hormone.

Factors That Affect Sleep


Just like humans, the sleep needs of cats and dogs vary with age. Puppies and kittens, for example, need more sleep than adult dogs and cats, sometimes up to 20 hours a day. This is because they are growing and developing rapidly, and sleep is essential for growth and development. As they become adults, they gradually require less sleep, but they still need plenty of downtime to rest and recharge.

Breed and Size

Breed and size also play a role in a cat or dog’s sleep needs. Large breeds tend to need more sleep than smaller breeds, as they have a greater mass to support. Brachycephalic breeds (those with short snouts), such as pugs and bulldogs, may also have more difficulty breathing during sleep, which can affect the quality of their rest.

Health Conditions

If your cat or dog is sleeping more than usual or seems excessively tired, it could be a sign of an underlying health issue. Conditions like hypothyroidism, anemia, and heart disease can all cause lethargy and fatigue. If you’re concerned about your pet’s sleep habits, it’s best to consult a veterinarian.

How to Help Your Pet Sleep Better

Create a Relaxing Environment

Just like humans, pets sleep better in a calm and soothing environment. Make sure your pet has a comfortable bed in a quiet, dark room, away from any noise or distractions. You can also use a white noise machine or calming scents like lavender to help them relax.

Establish a Bedtime Routine

Routines help to signal to your pet that it’s time to wind down and get ready for bed. Develop a consistent bedtime routine that includes winding down activities like a gentle massage or a relaxing chew toy. Stick to the same schedule every night to help your pet establish a healthy sleep pattern.

Make Regular Exercise a Priority

Regular exercise not only helps to keep your pet physically fit but also aids in better sleep. Make sure your pet gets plenty of exercise throughout the day, especially during their active periods. A tired pet is a sleepy pet!

Common Questions about Cat and Dog Sleep Patterns

  • Q: Why do cats sleep so much during the day?
  • A: Cats are crepuscular animals, which means they are most active during dawn and dusk. To conserve energy and be alert during hunting and scavenging, they take frequent naps throughout the day.
  • Q: Is it normal for my dog to sleep 16-20 hours a day?
  • A: Yes, dogs are naturally inclined to sleep for long periods to conserve energy for their active periods at dawn and dusk. However, if your dog is sleeping more than usual or seems excessively tired, it could be a sign of an underlying health issue.
  • Q: What can I do to help my pet sleep better?
  • A: Creating a relaxing environment, establishing a bedtime routine, and making regular exercise a priority can all help to improve your pet’s sleep patterns.


Cats and dogs sleep for many reasons, including conserving energy, napping throughout the day, and preparing for their active periods. Ensuring your pet gets enough rest is essential for their overall health and wellbeing. By understanding their sleep patterns and creating a calm, restful environment, you can give your furry friend the restorative sleep they need to be happy and healthy.


  1. “How Much Sleep Do Dogs Need?” American Kennel Club, accessed 19 August 2021, https://www.akc.org/expert-advice/health/how-much-sleep-do-dogs-need/.
  2. “Circadian Rhythms in Dogs and Cats in the Home Environment.” BMC Veterinary Research, Vol. 14, No. 20 (2018), accessed 19 August 2021, https://bmcvetres.biomedcentral.com/articles/10.1186/s12917-017-1298-0.
  3. “Why Do Cats Sleep So Much?” PetMD, accessed 19 August 2021, https://www.petmd.com/cat/behavior/why-do-cats-sleep-so-much.

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