Where do squirrels go at night to sleep?

Where squirrels go at night to sleep depends on the species, but most tree squirrels like Eastern gray squirrels and fox squirrels sleep in nests called dreys or in tree cavities, while ground squirrels sleep in underground burrows. A drey is a spherical nest about the size of a soccer ball made of twigs, leaves, moss, and shredded bark, built high in the fork of a tree or against the trunk where branches provide shelter and stability. Inside, squirrels line the drey with soft materials like grass, feathers, and fur for insulation. In colder weather or winter, squirrels may sleep in tree cavities or hollows which offer better protection from wind and rain. Some squirrels, especially in urban areas, sleep in attics, soffits, chimneys, and wall cavities of houses where it is warm and safe, which can cause problems for homeowners. Flying squirrels often sleep communally in groups in tree cavities to stay warm. Ground squirrels like chipmunks and prairie dogs sleep in underground burrow systems with multiple chambers for nesting and food storage. Squirrels are diurnal, meaning they are active during the day and sleep at night, usually returning to the same nest each night, and in winter they may share nests to conserve heat.