A Polar Bear's Day
Polar Bears are most active during the morning and least active in the evening. In the Arctic, females with cubs have been observed spending about 19% of their day hunting during the springtime months, and about 38% of their day hunting during the summer. Males spend slightly longer hunting than their female counterparts.
So, what are they doing when they are not hunting? If you are lucky enough to spend some time observing these huge mammals on Polar Bear watching holidays, you will note that they spend quite a bit of time resting and sleeping! If it's a warm day they will spread out on the ice and sometimes put their feet in the air, but when it is cooler, they will curl up and usually cover their snout to conserve warmth.
Hibernation
In winter, when food is scarce, females hibernate in order to preserve energy. Polar Bears are not deep hibernators though, and many of their bodily functions still work as normal. Males that do not hibernate when conditions are harsh and food is scarce have an effective way of conserving their energy supplies.