Yes, it is true that swifts can sleep in the air. Swifts are a type of bird that is well adapted to life in the air. They have a unique ability to stay airborne for long periods of time, even while they sleep.

Swifts have a special type of sleep called "unihemispheric slow-wave sleep," which allows them to rest one half of their brain at a time while the other half remains awake and alert. This allows them to maintain control of their flight and avoid potential dangers while they sleep.

During the day, swifts are constantly on the move, searching for food and navigating through the air. At night, they usually fly to high altitudes and enter a state of slow-wave sleep while still flying. This allows them to rest and conserve energy without the need to land and risk being attacked by predators.

Swifts are not the only birds that can sleep in the air. Other bird species, such as albatrosses and frigatebirds, also have the ability to sleep while flying. This adaptation allows them to stay airborne for long periods of time and travel great distances without needing to stop and rest.
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