Birds don’t sleep laying down like humans do since they have to be alert for predators at all times. They usually rest standing up, perched on something with their head turned to the side and resting on their shoulder.
Birds are very unique in that they can go to sleep at will. They use unihemispheric slow-wave sleep (USWS), which keeps one eye open and half of their brain awake. If they feel safe, they can make their whole brain go to sleep. For more protection, birds sleep in trees or dense vegetation so predators can’t see them.
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