The sleeping habits of deer include sleeping in dense grasses, changing head position frequently during sleep, returning to the same place for several days to sleep and being vigilant even during sleep. Deer typically follow a pattern of dozing briefly then becoming alert.
When deer bed down, they leave a distinct area of flattened vegetation that is 2 to 3 feet wide and 3 or 4 feet long. Deer often travel in herds, so it is common to find several such bed spots in the same general location.
Whitetail deer, the most common deer in the United States, doze anywhere from 30 seconds to a few minutes at a time. They briefly become alert and then doze again. This cycle of dozing and being alert typically lasts about 30 minutes.