Deer are happy with only a few hours of sleep - as animals which rely on their speed to escape predators, they
are not granted more. When the deer prepares its bed, it paws a camp and sets into a sidelong position in which it dozes or chews over with its head
In the deep sleep phases, deer have their eyes closed and their head lies
on the ground or on their own hind leg. They only sleep for a few minutes at a
time. During sleep, deer are vulnerable because they do not sense any
smells or soft noises.
A young Roe deer buck you can see in images below has just been set for a rest or maybe even a short nap.