No, Siberian tiger do not hibernate. They do, however, sleep around 18, or more, hours per day. Sleeping is an important energy-saving and energy-generating process for all tigers, especially the Siberian subspecies, which require a lot of effort to catch their prey, as they may have to travel for more than 20 miles a day before finding food. Moreover, it is impossible for them to actually hibernate for two major reasons. One being the fact that most cats do not possess the ability to sleep heavily. In contrast, most cat species, including the Siberian tiger, sleep very lightly, always vigilant for danger and prey animals. The second reason is that a Siberian tiger would not survive an entire winter without food, since they need to feed at least once every week, if not more frequently.