The time that birds go to bed is often at sunset but it depends on the bird species although most birds go to sleep as soon as the sun sets and it gets dark which could be 5:00 PM to 8:00 PM or later depending on when the sunsets.
Some birds are also nocturnal and stay awake at night and sleep during day.
Examples of nocturnal birds are nighthawks and owls which are active during the night and sleep in the daytime.
All birds require a minimum of 10 hours of sleep and a maximum of 12 hours of sleep.
Most wild birds will go to sleep as soon as the sun goes down and then wake up as the sun rises.
Many wild birds have evolved to avoid activity at night to reduce their chances of being hunted by nocturnal predators.
Many birds also rely on their sight to find their food and their sight is less effective at night.
So it's not practical for birds that are active in the day to be active and vocal at night when they cannot see clearly.
Birds don't always sleep in the same place every night although birds may also return to the same roosting spot over and over.
The place at which a bird sleeps depends on the species of bird, the time of year and also the weather.
Many birds like songbirds sleep in trees and cling to tree branches.
And birds such as nuthatches, chickadees and titmice sleep in old woodpecker holes.
Some birds may also sleep in nesting boxes or birdhouses during the winter.
Birds such as waterfowl birds such as geese and swans sleep in water and swim or sit on islands and some gamebirds and shorebirds sleep on the ground.