Where do owls sleep during the night?
Owls sleep in barns and trees during the night, if they sleep at all.
Because they are nocturnal much like other nocturnal animals they sleep in dark places all day (owls sleep in tree holes), owls have eyes adapted to seeing at night, if they were to fly during the day they would be blinded and subsequently crash into something and fall to their death. Plus their hearing is capable of hearing faint movements of mice/rats during the night.
Well, the owl is a form of owls. They belong to the exact same family, called the owl group. The owl group houses many owls of all types. Including burrowing. These owls usually sleep during the day and hunt during the night. They are very facinating creatures. The burrowing owl is only one type of owls.