Are Squirrels Nocturnal? Understanding Their Sleeping Patterns

Watch a squirrel long enough and the question asks itself: that animal was racing around at 7 a.m., vanished by noon, then showed up again right before dark. So — are squirrels nocturnal? No. Tree squirrels and ground squirrels are diurnal: they do their living in daylight and sleep at night. The confusion comes from their rush-hour schedule — most species peak in the first hours after sunrise and the last hours before sunset. And there is one genuine exception: the flying squirrel, which truly owns the night.

This guide breaks down exactly when each type of squirrel is active, where they go after dark, why so many people get the answer wrong, and how the seasons shift the whole schedule.

What Do “Nocturnal,” “Diurnal,” and “Crepuscular” Mean?

These three words describe when an animal is awake, and mixing them up is half the reason this question exists.

• Nocturnal — active at night, asleep during the day. Owls, bats, and (as we’ll see) flying squirrels.
• Diurnal — active during the day, asleep at night. Humans, most birds, and most squirrels.
• Crepuscular — active mainly at dawn and dusk, in the twilight edges of the day. Deer and rabbits are classic examples — and several squirrel species lean this way.

Most tree squirrels sit somewhere between diurnal and crepuscular: they sleep through the night, but their busiest hours hug sunrise and sunset rather than high noon.

Are Squirrels Nocturnal? The Short Answer

It depends on the squirrel. The squirrel family holds more than 280 species, but they fall into three groups with three different schedules:

The everyday squirrel raiding your bird feeder is a day-shift animal. The one gliding between trees at midnight is almost certainly a flying squirrel.

A Day in the Life of a Tree Squirrel

First light: the morning rush

Tree squirrels wake with the sun, or just after it. Eastern gray squirrels reach peak activity roughly two hours after sunrise. First order of business is breakfast — nuts, seeds, buds, fungi, and whatever the season offers. Mornings are also prime caching time. A gray squirrel can bury hundreds of nuts in a single autumn week, mapping each hiding spot with a spatial memory that embarrasses most humans: scatter-hoarding studies show they recover the large majority of their caches, navigating by memory first and smell as backup.

Midday: the slow hours

By late morning, activity drops. Fox squirrels are famous for this pattern: forage hard in the morning, loaf through the middle of the day, then rally again in the evening. On hot summer days the midday break stretches longer — squirrels sprawl flat on cool branches to dump body heat before the evening shift.

Late afternoon: the second rush

The two hours before sunset bring the day’s second peak. This is last-call foraging — topping off energy reserves and tucking a few more nuts away before dark. If you have ever noticed squirrels suddenly everywhere at 5 or 6 p.m., this is why.

Night: lights out

When the light fades, tree squirrels clock out. They retreat to a drey or a tree cavity and sleep until morning. Their eyes are built for daylight — dichromatic vision that is sharp enough to spot a hawk against the sky but weak in the dark — so nighttime foraging would be both dangerous and pointless.

Why Do So Many People Think Squirrels Are Nocturnal?

Five mix-ups keep this myth alive:

1. The dawn-and-dusk rush looks like night activity

Most people notice squirrels when they themselves are coming or going — early morning, or evening after work. Those happen to be the squirrel’s two peak windows. If you only ever see an animal at the edges of daylight, “nocturnal” feels like a reasonable guess. It isn’t: the animal was asleep all night and will be back in its nest within the hour.

2. Daytime attic noises get misremembered as nighttime ones

Here is a genuinely useful rule: scratching in the attic during the day usually means a tree squirrel; scratching at night usually means something else — flying squirrels, mice, or rats. Tree squirrels are loud tenants. People hear the racket, assume it went on all night, and file the memory under “nocturnal.”

3. Rats and mice take the blame — and give it

Rats and mice are true nocturnals, and they share the squirrel’s size, shape, and love of attics. A homeowner who spots a small furry animal on a night camera often calls it a squirrel. It usually isn’t. If it is out at 2 a.m., bet on rat, mouse, or flying squirrel — in that order.

4. Flying squirrels really are out at night

This one is fair. Flying squirrels are common across much of North America and strictly nocturnal, so a fair share of genuine “squirrel at night” sightings are real — just the wrong species. Most people have never knowingly seen a flying squirrel, so they credit the night shift to squirrels in general.

5. Streetlights stretch the workday

In well-lit suburbs, bright security lights and streetlamps can nudge squirrel activity past sunset. A squirrel grabbing one last snack under a floodlight at 9 p.m. isn’t nocturnal — it is a diurnal animal taking advantage of artificial daylight.

Where Do Squirrels Sleep at Night?

When the day shift ends, each group heads for its own kind of bedroom:

• Tree squirrels sleep in dreys — sturdy ball-shaped nests of twigs, leaves, and bark wedged into a tree fork — or in sheltered tree cavities. A single squirrel may keep several dreys and rotate between them.
• Ground squirrels retreat underground into burrow systems, plugging the entrance behind them. Some burrows run several feet deep, with separate chambers for sleeping and food storage.
• Flying squirrels den communally in tree cavities, old woodpecker holes, or nest boxes — often piling together in groups to share warmth, especially in winter.

Our guides to where squirrels sleep and how squirrels build nests go deeper on dreys, cavities, and burrows.

Flying Squirrels: The True Night Shift

North America has two flying squirrel species — the southern flying squirrel (Glaucomys volans) and the northern flying squirrel (Glaucomys sabrinus) — and both are strictly nocturnal. Their whole body is built for it: huge eyes gather what little light the forest offers, and soft, silent fur keeps their glides quiet enough to dodge owls.

Their night runs on two shifts: roughly an hour after sunset they pour out for about two hours of foraging and gliding, then again for an hour and a half to two hours before sunrise. Between shifts they rest. A single glide can carry them more than 150 feet from treetop to treetop, steering with their legs and braking with that broad, flat tail.

In cold snaps, flying squirrels huddle together in groups and drop into torpor — a short, light standby mode that saves energy without the deep shutdown of true hibernation. Come spring, the night shift resumes.

How Squirrel Sleep Actually Works

Squirrels don’t just “go to bed” — their sleep is a tuned survival system. During the night, a tree squirrel cycles through light sleep and deeper rest much like other mammals, but it stays wired for alarm. The slightest scrape of claws on bark or the silhouette of an owl can snap it awake in a fraction of a second. This hair-trigger arousal is why a squirrel that looks deeply asleep can explode out of a drey before you finish blinking.

Sleep also does heavy lifting for memory. The same spatial recall that lets a gray squirrel find buried nuts months later is consolidated during rest — researchers studying scatter-hoarding rodents have found that sleep plays a role in locking in cache locations. In other words, the night’s sleep is part of what makes the morning’s foraging work.

How much do they sleep? There’s no single number — it shifts with season, temperature, and food pressure. In deep winter, a tree squirrel may spend the large majority of a 24-hour cycle inside its drey, dozing in torpor between brief foraging trips. In the abundance of early fall, it may be out and moving for most of the daylight hours. The pattern is flexible; the rule — active by day, asleep by night — is not.

Torpor vs. Hibernation vs. Sleep: Don’t Mix These Up

Three different shutdown modes get tangled together in squirrel articles, so here’s the clean version:

• Sleep is the nightly routine: normal body temperature, easy to wake, happens every night in the drey.
• Torpor is a short, shallow standby — body temperature and heart rate drop for hours or a few days to save energy during cold snaps or food shortages. Tree squirrels and flying squirrels both use it. The animal can still wake fairly quickly.
• Hibernation is the deep, months-long version: dramatically lowered body temperature, barely-there heartbeat, no waking for weeks. Among squirrels, only some ground squirrels — like the thirteen-lined ground squirrel — do this for real.

So when someone says “squirrels sleep all winter,” they’re describing torpor in tree squirrels and true hibernation in ground squirrels — two different things wearing the same sentence.

How the Seasons Change the Schedule

The day-shift pattern holds year-round, but the hours slide with the calendar:

• Spring: Long active days. Breeding season means extra foraging to feed growing young, with both morning and evening peaks running strong.
• Summer: Heat rules the schedule. Squirrels front-load activity into the cool morning hours, siesta through the midday heat, and return for a shorter evening session.
• Fall: The busiest season. Caching becomes nearly a full-time job, and activity stretches across more of the day as squirrels race the coming cold.
• Winter: Short days, short shifts. Tree squirrels don’t truly hibernate — instead they ride out the worst cold in their dreys, slipping into torpor for hours or days, then emerging on milder days to raid their buried caches. Ground squirrels like the thirteen-lined species go further and hibernate in earnest.

For the full winter story, see our guide to whether squirrels hibernate.

Frequently Asked Questions

Are squirrels nocturnal or diurnal?

Diurnal, with one exception. Tree squirrels and ground squirrels are active during the day and sleep at night. Flying squirrels are the only truly nocturnal squirrels.

Why are squirrels so active at dawn and dusk?

Those are their peak foraging windows. Cooler temperatures, softer light, and fewer midday predators make dawn and dusk the most profitable — and safest — hours to gather food. This twilight-heavy pattern is called crepuscular behavior.

What should I do if I hear squirrels in my attic at night?

First, check the timing. Noises during the day point to a tree squirrel; noises at night point to flying squirrels, mice, or rats — and each needs a different removal approach. A wildlife professional can identify the animal from the sound pattern and droppings.

Do squirrels sleep all night?

Essentially, yes. Once settled in a drey, cavity, or burrow, a tree squirrel sleeps through the night and wakes near sunrise. They don’t take “night shifts” — poor night vision makes after-dark activity a bad deal.

Are baby squirrels nocturnal?

No. Young squirrels follow the adult pattern: awake and nursing or playing during the day, asleep at night. Very young kits in the nest sleep most of the day too, waking mainly to nurse.

Can squirrels see in the dark?

Tree squirrels see poorly in the dark — their eyes are tuned for daylight. Flying squirrels are the exception, with large eyes adapted for low-light gliding and foraging.

Sources

• Misfit Animals — seasonal activity patterns by squirrel species
• Environmental Literacy Council — flying squirrel nocturnal behavior and activity windows
• Denali Education Center — northern flying squirrel natural history, torpor and communal denning