On very normal circumstances, whitetail deer sleep daytime, when the woods are relatively bright. At daylight hours, deer might be seen sleeping in areas where there are bushes and shrubs of up to 5 feet, where they can be hardly seen by predators and hunters. Also, areas that are thick, make good beds of grass as well as weed are considered to be just right for deer bedding or sleeping during the day. These places are chosen to keep them hidden from hunters and predators.
A deer typically has bad eyesight during the day and good eyesight during night hours and uses it as a guard against predators. Deer sleeps very little at night and when they do, they sleep in dark areas, unlike the day time.