Your turn
Each lab is one step from the video. Change things and see what happens.
Each lab isolates one part of the story. The models are simplified to show the idea.
Tap the buttons and slide the sliders.
Flip between the cat and the person. Who sleeps more, and in how many pieces?
Compare the polyphasic cat day with a consolidated human night.
Tap Cat, then Person. Who has more blue?
Pounce until the battery runs low. How long does a nap take to fill it up again?
Spend energy in bursts, then rest: why is long inactivity the efficient strategy for an ambush hunter?
Tap Pounce lots of times. Then let the cat nap.
A picture of the idea, not a measurement of a real cat’s energy.
When is the cat busiest? When does it nap?
Find the two activity peaks and the two troughs. How do they line up with prey?
Slide the sun. When does the cat wake up?
Curve shape after one study of 14 indoor cats (Parker et al. 2019); every cat differs.
Pick a kind of sleep, then clap. When does the cat wake up?
Clap in each stage: how does arousal threshold change from light slow-wave sleep to REM?
Pick one, then clap! Does the cat wake up?
Tap each animal. Why does the lion sleep so much more than the giraffe?
Compare predator and prey: what sets how much an animal can afford to sleep?
Lion and giraffe numbers are from zoo studies; wild giraffes often doze standing up, half awake.
Pick a kitten, an adult or an older cat. What does boredom do? What does playtime do?
Change age and lifestyle: which changes are normal, and which would be worth a vet visit?
Pick a cat. Then try Bored and Playtime.
Example days sized to the ranges in the sources, not real recordings.
Cats sleep a lot. Most of the day, in fact! They don't sleep in one big block like you. They take lots of little naps, all day and all night.
Cats are sneaky hunters. They wait, creep, and then pounce! A pounce is super fast, and it uses up lots of energy. So after hunting, a cat rests to fill its energy back up.
Cats are busiest when the sun comes up and when it goes down. That's when birds and mice come out. In the middle of the day and in the middle of the night, cats nap.
Most of the time a sleeping cat is only dozing. Its ears keep listening, so it can wake up fast. Sometimes it sleeps very deeply. Then its eyes wiggle and its paws twitch. It might be dreaming!
Kittens sleep the most, because they are growing. Old cats sleep a lot too. Playing with a toy mouse keeps a cat busy and happy.
Want more? See why sleep is important. ← More explainers
Most cats sleep about 12 to 16 hours a day, and some get close to 20.116 That isn't laziness. Cats are predators that hunt by sneaking up and pouncing, which uses a lot of energy in short bursts, so they rest a lot in between.114
Three things explain the long hours:
Even a pet cat that gets its dinner from a bowl keeps the same built-in schedule as its hunting ancestors.1
Sources give different numbers, and it helps to know why. Cats rest a lot without being fully asleep, and a dozing cat and a resting cat can look the same from the outside. So the answer depends on how you count.
| Source | What it says |
|---|---|
| Britannica | An average of about 15 hours a day; some cats, especially kittens and older cats, stretch toward 201 |
| PetMD (veterinary site) | 12 to 16 hours; kittens up to 2014 |
| Merck Veterinary Manual | Asleep about 40% of the day (around 10 hours) and resting another 22% (around 5 hours)2 |
| Sleep Foundation, citing a survey study | More than half of cats sleep 12 to 18 hours; nearly 40% more than 1813 |
A common estimate: most adult cats sleep about 12 to 16 hours a day. Cats also rest quietly, and sources differ in how they separate resting from sleeping. For comparison, the CDC recommends at least 7 hours for adults and 8 to 10 hours for teenagers.15 So a cat can sleep roughly twice as much as you.
A cat also doesn't sleep in one block like most people do. It sleeps in many naps across the day and night. Scientists call that polyphasic sleep.13
A cat is an ambush hunter. It waits, creeps closer and then pounces in a short, explosive burst. Britannica sums it up: sneaking up and pouncing, again and again, is exhausting, and that much effort needs a lot of recharging.1
Wild cats also need to hunt many times a day. Their usual prey, like mice, is a small meal, and cats naturally prefer lots of small meals (about 13 a day, according to the Merck manual).2 So a cat's day is lots of short bursts of effort with long rests in between.
Sleep saves energy. Sleep scientist Jerome Siegel describes sleep as a kind of "adaptive inactivity": it keeps an animal still at times when being active would be risky or wasteful, and it lowers the body's and brain's energy use, "analogous to turning out the lights when you leave a room".7 In the explainer's toy, the battery is a simple picture of that idea, not a measurement.
Play is a pet cat's version of hunting. Cats like toys that look and move like prey, and they love to chase and pounce on them.162
Many people think cats are night animals. In fact cats are crepuscular: they're most active in the twilight around dawn and dusk.12 That's when their wild food is on the move. Birds are up at daybreak and mice come out as night falls.113
A 2019 study tracked 14 indoor cats with activity trackers. Their activity peaked early in the morning, just before sunrise (around 5 to 6 am), and again in the late afternoon before sunset. They were least active between about 1 and 3 am and between about noon and 3 pm.5 That's why so many cat owners get a wake-up call at 5 am.
Cats are flexible, though. Each cat differs a little, and pet cats also fit their routine to the household: in that study the morning peak came before fresh food was put out, and the evening peak after the staff went home.5
A sleeping cat isn't always deeply asleep. Like us, cats cycle through different kinds of sleep.13
| Kind of sleep | Share | What you can see |
|---|---|---|
| Light dozing (slow-wave sleep) | About 3/4 | The classic cat nap, usually 15 to 30 minutes. Ears still twitch towards sounds; the cat can wake in an instant114 |
| Deep sleep | About 1/4 | Comes in short spells of about 5 minutes, broken up by dozing1 |
| REM sleep (part of the deep sleep) | — | Eyes move under closed lids, the body goes limp, paws and whiskers may twitch113 |
During REM sleep (rapid eye movement sleep) the brain is very active but the body's muscles are almost completely switched off, a state called REM atonia.17 A few twitches still get through, which is why a cat's paws may tremble. In experiments where the brain switch that relaxes the muscles was turned off, researchers saw cats appear to act out their dreams, and most scientists think cats probably do dream during REM, as people do.131 Cats are among the mammals with the most REM sleep: a review lists house cats with ferrets and platypuses as spending 3 hours or more a day in REM, compared with less than an hour for horses, giraffes and elephants.11
Want to know more about dreaming? See how dreams work.
Across mammals, daily sleep ranges from under 3 hours to more than 20.7 Bats and opossums sleep around 18 to 20 hours; elephants and giraffes as little as 3 or 4.6
| Animal | Sleep per day (about) | Why |
|---|---|---|
| House cat | 12–16 h16 | Burst hunter, safe at home |
| Lion (zoo study) | About 21 h resting, of which about 14 h asleep8 | Top predator with few enemies |
| Giraffe | About 4.6 h in a zoo study; in the wild they often doze standing, half awake910 | Hunted by lions; needs lots of time to eat |
| Wild African elephant | About 2 h9 | Large plant-eater; needs lots of time to feed |
| Adult person | at least 7 h recommended15 | One long block at night |
Siegel puts it simply: lions sleep long and deeply, while giraffes have one of the lowest recorded sleep durations "and must not sleep deeply".7 Large plant-eaters may sleep less because they are more at risk from predators, and because their low-energy food takes many hours to eat.6 Wild giraffes usually nap standing up, half awake; in zoos they also sleep lying down.10
Some animals solve the problem in another way. Dolphins and some other sea mammals rest one half of the brain at a time.18 Find out more in how do whales sleep.
Kittens are still growing, and can sleep up to about 20 hours a day.141 In their first couple of weeks, most of a kitten's sleep is an active, REM-like sleep; calmer slow-wave sleep only appears at around two to three weeks old.12
Older cats tend to be less active and playful and may sleep more.3 PetMD notes that cats aged about 10 and up commonly spend more time asleep, sometimes because of stiff joints.14
An indoor cat with nothing to do may nap simply because it's bored.114 Things to climb and scratch, puzzle feeders, a window to watch and regular play sessions keep a cat busy.14 A good time to play is dusk, when your cat's hunter clock says "go".
What matters most is change. If your cat suddenly sleeps a lot more than usual, or its sleeping or eating patterns change, the Cornell Feline Health Center says not to put it down to old age: have a vet take a look.3 Sleeping more can be a sign of illness, for example anemia.4
More cat science: how cats see and how cats purr. And for your own sleep: why sleep is important.
Usually about 12 to 16 hours, with around 13 to 15 hours a common average. Some cats, especially kittens and older cats, sleep close to 20 hours. Numbers vary between sources partly because it's hard to tell a resting cat from a sleeping one: the Merck Veterinary Manual counts about 40% of the day as sleep and another 22% as rest.
It's normal for a healthy cat to sleep much of the day, because cats are most active around dawn and dusk and nap during the middle of the day and night. What matters is change: if your cat suddenly sleeps a lot more (or less) than usual, stops eating or seems unwell, talk to a vet.
Roughly two-thirds is a fair estimate. Sleeping about 16 hours a day would be two-thirds of the day, and 12 to 16 hours is half to two-thirds. 70% would be about 17 hours, a bit above that range, so '70%' is a stretch for most adult cats. Kittens and old cats can sleep that much or more.
Twitching paws, whiskers and eyes usually happen during REM sleep, a deep stage when the brain is very active but the body's muscles are almost switched off. Small twitches still get through. Scientists think cats probably dream during REM sleep, as people do.
Partly. Cats are crepuscular, meaning they're busiest in the twilight around dawn and dusk. They often nap in the middle of the night and in the middle of the day. Many pet cats shift their schedule a little to match their people, especially around mealtimes.
Usually their eyes are closed, and in light dozing their ears keep turning towards sounds. That light sleep lets it wake up almost instantly.
Science can't read a cat's feelings directly, so there's no simple answer. What vets do say is that an indoor cat with nothing to do may sleep more out of boredom. Things to climb and scratch, a window to look out of, puzzle feeders and regular play help keep a cat busy while you're away.