Ashwin Lewis
Birds have several techniques for getting some rest. Nocturnal birds like owls and nighthawks wake up as the sun sets and hunt at night, while most birds are diurnal, meaning they're awake during the day and asleep at night. Diurnal birds will find a perch, fluff out their down feathers, turn their head around, tuck their beak into their back feathers, and pull one leg up before falling asleep. Some birds, like waterfowl and shorebirds, sleep near the water, while others sleep while flying. Birds need around 10-12 hours of sleep, and this sleep doesn't have to be in one go—they often take hundreds of short snoozes each day. They also don't need total darkness to sleep, but they do need a certain level of darkness to trigger their night cycle.
| Characteristics | Values |
|---|---|
| Sleep duration | 10-12 hours |
| Light conditions | Total darkness |
| Sleep posture | Fluffed feathers, tucked beak, one leg pulled up |
| Sleep location | High in dense branches of trees, cavities of tree trunks, thick shrubbery, foliage, birdhouses, nesting boxes |
| Sleep cycle | Unihemispheric slow-wave sleep (USWS) |
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What You'll Learn
- Nocturnal birds, like owls and nighthawks, are active at night and sleep during the day
- Diurnal birds are active during the day and sleep at night
- Birds fluff their down feathers to keep warm while sleeping
- Some birds sleep in trees, while others sleep near water or in chimneys
- Birds are conscious sleepers, with only half their brain disengaged while they rest
Nocturnal birds, like owls and nighthawks, are active at night and sleep during the day
Owls are the most well-known example of nocturnal bird species, with their distinctive heart-shaped facial discs, large eyes, and fluffy plumage. They have excellent night vision and hearing, which helps them navigate and hunt in the dark. Other nocturnal bird species include nighthawks, nightjars, frogmouths, and whip-poor-wills. These birds are also active during the hours of darkness and sleep after the sun rises.
Nocturnal birds have several adaptations that help them survive at night. They tend to have larger eyes with a high concentration of photoreceptor cells, allowing them to see well in low-light conditions. They also have specialized feathers that enable them to fly silently, making it easier to hunt undetected. Most nocturnal birds are carnivorous, feeding on rodents and other small mammals that are active at night.
The sleep patterns of nocturnal birds can be affected by light pollution, especially in urban areas. Artificial light can disrupt their sleep, causing them to get less deep REM sleep. Nocturnal birds may also face challenges finding safe and concealed spots to rest during the day, as they are more vulnerable to predators when they are asleep.
Overall, nocturnal birds have evolved unique characteristics and behaviors that allow them to thrive in the nighttime environment, including enhanced senses, specialized feathers, and distinct hunting and sleeping patterns.
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Diurnal birds are active during the day and sleep at night
Diurnal birds have advanced colour vision, which is an adaptation to being awake during the day. They also have excellent eyesight, with a wide field of vision and the ability to see behind them by turning their heads almost 180 degrees. This enhanced vision helps them locate prey and navigate during the daytime.
When it's time to sleep, diurnal birds will find a perch, such as a branch or a windowsill, to rest on for the night. They will fluff out their down feathers, turn their heads around, tuck their beaks into their back feathers, and pull one leg up to their belly. This position helps them stay warm, as the down feathers hold in heat, and provides stability, as the bird's weight on its feet tightens the tendons, giving it a strong grip on the perch.
While diurnal birds are mostly active during the day, they may still be awake and active during twilight hours or migrate at night to avoid predators. They also tend to sleep in short intervals, always being ready to spring into action if they sense a threat.
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Birds fluff their down feathers to keep warm while sleeping
Birds have several techniques to get some sleep. Nocturnal birds like owls and nighthawks are more active at night, whereas most birds are diurnal, meaning they are awake during the day and sleep at night. Before falling asleep, birds will usually fluff out their down feathers, turn their head around, tuck their beak into their back feathers, and pull one leg up to their belly.
Down feathers are the short, fluffy feathers under the sleek outer ones that help hold in heat. When birds fluff up their feathers, they create hundreds of air pockets that trap heat, maximising their natural insulation. This is particularly important for smaller birds, which have greater heat loss problems than larger birds due to their higher surface area-to-volume ratio. In addition to fluffing their feathers, birds in colder climates may also grow a heavier coat of plumage to increase insulation.
Birds will also seek shelter from the cold by roosting in dense trees or shrubs, or in tree crooks, cavities, and manmade structures. They may also huddle together in rows or clusters to share body heat. During the winter, many bird species increase their insulation and energy reserves by eating more.
While some birds may adapt their sleep schedule to that of their owners, it is generally recommended that pet birds get around 10-12 hours of uninterrupted sleep and darkness per night. Interrupting a bird's sleep can lead to unpleasant behaviour and health issues.
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Some birds sleep in trees, while others sleep near water or in chimneys
Birds do not need complete darkness to sleep, but they do prefer to block out light when they sleep during the day. Nocturnal birds like owls and nighthawks are just waking up as the sun sets and will hunt at night. During the day, they find a safe place to roost, closing their eyes to block out the light.
Some birds sleep in trees. Wild birds are good at finding shelter, and those that raise their young inside holes in trees, such as woodpeckers and bluebirds, often sleep in such cavities at night, all year round. Other birds find protected spots inside dense foliage in trees, shrubs, or vines. They may perch close to the trunk on the downwind side.
Some birds sleep near water. Waterfowl and shorebirds sleep near the water. Ducks often stand at the water's edge or on a partially submerged stick or rock and tuck one foot into their body, much like birds that sleep on branches.
Some birds sleep in chimneys. Chimney Swifts have been documented resting when clinging to the insides of chimneys.
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Birds are conscious sleepers, with only half their brain disengaged while they rest
Birds are indeed conscious sleepers. Unlike humans, only half of a bird's brain is disengaged while it is resting. This phenomenon is called unihemispheric slow-wave sleep (USWS) and allows birds to remain alert to potential dangers while still getting adequate rest. During USWS, birds can quickly spring into action if they sense a threat, or a neighbour, or if they experience cold conditions.
Birds that migrate or fly in flocks may rely on USWS to rest while navigating their flight path. There is evidence that the Alpine Swift, for example, can fly non-stop for 200 days, sleeping while in flight!
Ducks and waterfowl are particularly good at USWS, and other birds such as Peregrine Falcons and Eurasian Blackbirds can do this as well. Some birds even sleep with one eye open, with half of their brain remaining alert while the other half sleeps.
In addition to USWS, birds have several other techniques to get some rest. Most birds are diurnal, meaning they are awake during the day and sleep at night. Nocturnal birds, like owls and nighthawks, are active at night and sleep during the day. During the daytime, they find a safe place and close their eyes to block out the light.
Birds also have specific sleeping positions and choose locations that will keep them safe from predators, such as high in tree branches or inside trees. They fluff out their down feathers to stay warm, tuck their beaks into their back feathers, and pull one leg up to their belly before falling asleep. Waterfowl and shorebirds sleep near the water, and ducks may sit on partially submerged sticks or rocks and tuck one foot into their body.
While it may seem that darkness is necessary for birds to sleep, this is not always the case. Some birds sleep with a faint nightlight on to prevent night frights. In general, birds need about 10-12 hours of darkness to get adequate sleep, but this can vary depending on the bird and their environment.
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Frequently asked questions
Yes, birds need darkness to sleep. Budgies, for example, need 10-12 hours of darkness to sleep, otherwise, their night cycle won't kick in.
Birds rarely use nests to sleep in unless they are incubating eggs or caring for chicks. Nests are not especially clean or comfortable for sleeping.
Birds sleep in a variety of places. Many sleep high in the dense branches of trees, away from predators and bad weather. Some birds, like woodpeckers, sleep in the cavities of tree trunks. Smaller birds find shelter in thick shrubbery or foliage, while others sleep in man-made birdhouses or nesting boxes. Waterfowl and shorebirds sleep near the water.
Birds fluff their down feathers to create warmth, tuck their beaks to protect their vulnerable parts, and pull up one leg. They sleep standing on one leg, hanging upside down, floating on water, laying on the ground, swimming, and even standing.
