Evie Summers
Birds have several techniques for when they need to get some sleep. Nocturnal birds like owls, nighthawks, and nightjars hunt at night and sleep during the day. Diurnal birds, which are most birds, are awake during the day and sleep at night. They often seek out safe, sheltered places to roost for the night, such as dense foliage, cavities, and niches in trees, or high in the tree canopy, away from predators and protected from the weather. Some birds also sleep standing on one leg, tucking their heads into their feathers to conserve body heat.
| Characteristics | Values |
|---|---|
| Do birds need a quiet place to sleep? | Yes, birds prefer to sleep in a quiet, safe place away from predators and bad weather. |
| Where do birds sleep? | Birds sleep in trees, bushes, crevices, or other sheltered spots. Small birds often sleep high in the tree canopy, close to the trunk, while ducks sleep floating on the water or at the water's edge. |
| How do birds sleep? | Birds can sleep with one eye open, a technique called unihemispheric slow-wave sleep (USWS) or unihemispheric slow-wave sleep, which allows them to stay vigilant for danger while resting. |
| Do all birds sleep in the same way? | No, different bird species have different sleeping strategies. For example, some birds sleep with both eyes closed if they feel safe, while others may sleep with one eye open most of the time. |
| Why do birds need a quiet place to sleep? | A quiet, safe place allows birds to get the necessary amount of deep sleep. Sleep is important for birds as it allows for healing, restoration, memory processing, and protection from predators. |
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What You'll Learn
Nocturnal birds sleep during the day
Nocturnal birds, such as owls, nighthawks, nightjars, frogmouths, and whip-poor-wills, are more active at night. They wake up as the sun sets and hunt in the darkness. During the daytime, they find a safe place to rest. Owls, for example, roost in cavities or on branches, taking advantage of their camouflaged plumage to blend into their surroundings.
Nightjars, which are found in forests, grasslands, and deserts, have cryptic plumage that makes it difficult to spot them against leaf litter during the day. They also roost in dense foliage or among tree branches.
Kiwi, a nocturnal bird native to the forests of New Zealand, is both flightless and endangered. They have soft feathers that enable them to move silently through their habitats, as well as an acute sense of smell that helps them locate food on the forest floor.
Nocturnal birds face challenges when sleeping during the day due to light and noise pollution. They adapt by roosting in sheltered spots, such as cavities, tree hollows, or camouflaged next to tree trunks, where they can remain undisturbed. They may also employ a type of sleep known as Unihemispheric Slow-Wave Sleep (USWS), where half of their brain remains alert while the other half sleeps. This allows them to rest while still being able to quickly respond to potential threats.
The presence of ambient light impacts the sleep patterns of nocturnal birds. They tend to sleep for shorter periods during the summer when the days are longer, and the presence of artificial light can cause disturbances.
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Diurnal birds sleep at night
Most birds are diurnal, meaning they are awake during the day and sleep at night. Diurnal birds find safe, sheltered places to roost for the night. They often seek out dense foliage, cavities, and niches in trees, or they perch high in tree foliage, away from predators and protected from the weather.
Smaller birds, like finches and cardinals, will perch high in trees, close to tree trunks, which often retain the sun's warmth from the daytime. Other birds make use of birdhouses and nesting boxes, especially if they can count on food and water being close by. They also may take advantage of sheltered places like barns, roofs, and ledges to roost under.
Ducks and other waterfowl sleep floating in the water, while wading birds like herons and egrets sleep standing in water or on land.
During sleep, most birds will puff up their feathers and tuck their feet and bills into their feathers to protect them and keep them warm. Less body heat is lost in this position. Most birds go into a half-conscious state while sleeping, allowing them to rest while remaining alert to danger.
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Birds don't sleep in nests
So, if not in nests, where do birds sleep? The short answer is: away from predators. Depending on the type of bird, they may sleep in different places and in different ways. For example, songbirds need to avoid ground predators like cats, so they stay off the ground. But they also need to keep out of open spaces to avoid owls, which hunt at night. These birds tend to seek out dense foliage or brush to hide in overnight. This foliage acts as camouflage, keeping them safe and secure.
Perching birds, or passerines, sleep while perched. They have developed a type of flexor tendon in their legs that involuntarily clasps shut when squatting on a perch. The tendons will stay in this position until the bird straightens its leg and it won't be able to leave its roost until it's ready. Some birds have even been seen sleeping upside down thanks to this tight grip!
Birds also prioritise staying warm while they sleep. Many bird species, including hummingbirds, enter a state of torpor, which lowers their body temperature and conserves energy to help them survive the cold nights. Many birds will also gather in large flocks to share body heat as they sleep. They may huddle together in cavities under roofs, bridges, ledges, or barns, using the group to provide warmth.
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Birds sleep with one eye open
Birds are very different from humans when it comes to sleep. They sleep in short bursts, only a few minutes at a time, repeating these short bouts hundreds of times over 24 hours. They can also sleep with one eye open, a phenomenon called unihemispheric slow-wave sleep (USWS). During USWS, one half of the bird's brain is asleep while the other half stays alert. This allows them to be vigilant for any signs of danger while still getting some rest.
Ducks are a prime example of birds that sleep with one eye open. When floating on a pond, you may notice that one duck in a flock will have one eye open and the other shut. This bird is sleeping with half of its brain while keeping watch for potential threats with the other half. Ducks at the edge of the flock tend to keep their open eye facing away from the group, towards the direction where predators are more likely to sneak up. Ducks in the middle of the group often feel more secure and allow themselves to close both eyes and sleep with their entire brains.
USWS is not limited to ducks; it has been observed in various bird species, including chickens, parakeets, falcons, sparrows, and frigatebirds. It is believed that this ability to control sleep developed alongside the birds' physiology, which includes special feathers and complex muscles in their legs that prevent them from being startled awake by external stimuli like changes in temperature or the need to maintain balance.
Birds that migrate over long distances, such as swifts and martins, also utilise USWS to sleep for a few seconds at a time while in flight. This ability to sleep and navigate simultaneously is thought to be how the Alpine Swift can fly non-stop for 200 days.
Not only do birds sleep with one eye open, but they also have control over when they wake up. When sleeping in flocks, the birds on the edges, or the "group-edge effect," keep their outermost eyes open while resting the inner-side half of their brains. This way, they can keep watch for predators and quickly alert the rest of the flock if needed.
The ability to sleep with one eye open provides birds with a significant advantage in ensuring their safety and survival.
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Birds sleep in flocks for warmth and safety
Birds are fascinating creatures with some remarkable sleeping habits. While most birds are diurnal, meaning they are awake during the day and sleep at night, some birds are nocturnal and are active at night. Diurnal birds seek safe, sheltered spots to roost for the night, often in elevated places like buildings, cliffs, and telephone wires. They also perch high in trees, close to tree trunks, where the warmth from the sun remains.
Many bird species sleep in flocks, huddling together for warmth and safety. This behaviour is called communal roosting and it offers several benefits. Firstly, it provides safety in numbers, as there are more eyes and ears to look out for potential threats. Secondly, the large number of birds creates a concentrated warmth within the colony, helping them to stay warm during cold nights.
The position in which a bird sleeps within the flock can also determine the level of warmth and protection it receives. Birds in the middle of the flock are generally safer and warmer than those on the perimeter, and there may be a hierarchy that determines who sleeps where. For example, ducks sleeping on an open lake may enter a state of unihemispheric slow-wave sleep (USWS), where the birds at the vulnerable edges remain alert while those in the centre sleep soundly.
Some birds that sleep in flocks include herons, egrets, shorebirds, crows, starlings, and red-billed queleas. These birds often choose their roosting spots based on safety and warmth, and the flock provides a sense of community and protection for the birds within it.
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Frequently asked questions
Birds do not necessarily need a quiet place to sleep, as they can sleep with one eye open and half of their brain alert. This is called unihemispheric slow-wave sleep (USWS) and allows them to spring into action quickly if they sense danger. However, they do need a safe place to sleep, away from predators and protected from the weather.
Diurnal birds, which are active during the day and sleep at night, often seek out dense foliage, cavities, and niches in trees, or perch high in the tree foliage. Smaller birds, like finches and cardinals, will perch close to the tree trunk, where it is warmer. Other birds may use birdhouses, nesting boxes, or sheltered places like barns, roofs, and ledges. Waterfowl and shorebirds sleep near or on the water.
Birds do not typically sleep in their nests. Nests are used for incubating eggs and raising young. Once the chicks have fledged, the nest is usually abandoned, and a new one is built for the next breeding season.
Birds stay warm at night by fluffing out their down feathers, which hold in heat. They also tuck their beaks and legs into their feathers to conserve body heat.
