Birds generally go to safe, sheltered places to sleep at night, seeking protection from predators and harsh weather. Most diurnal birds (active during the day) roost in dense foliage, tree cavities, or high in the tree canopy, often close to tree trunks which retain warmth from the day. Small birds like finches and cardinals perch high up in trees, while some species use birdhouses, nesting boxes, barns, roofs, or ledges for shelter. Waterfowl such as ducks sleep floating on water, and wading birds like herons and egrets sleep standing in water or on land

. Birds have a special mechanism in their legs that allows them to grip branches tightly while sleeping, preventing them from falling. They also fluff their down feathers and tuck their beak and legs in to conserve heat during rest

. Some birds sleep communally in groups for added safety, and many can sleep with one eye open using unihemispheric slow-wave sleep, allowing them to stay alert to threats while resting. Nocturnal birds such as owls are active at night and sleep during the day, while most other birds sleep at night

. In summary, birds go to concealed, elevated spots like tree branches, cavities, or water surfaces to sleep safely through the night.