Do Bears Wake Up During Hibernation? More Questions Answered!

do bears wake up during hibernation

Hibernation is a state of inactivity and reduced metabolism that certain animals enter during the winter months. Hibernating animals can sleep for long periods, sometimes up to several months! But Do bears wake up during hibernation? Read on to find out!

Do Animals Sleep Through the Entire Hibernation Period?

The short answer is no; animals do not sleep through the entire hibernation period. Instead, they typically wake up multiple times throughout the winter. While bears are commonly thought of as true hibernators, they only enter a state of light sleep called torpor. Bears’ heart rates and body temperatures drop significantly during inactivity, but they can still easily be awakened.

So, why do bears bother going into torpor if they’re going to wake up again anyway? The main reason is food availability. If there’s not enough food to support an animal’s energy needs, it makes sense to conserve what little energy is available by entering a state of torpor.

Are There Any Animals That Completely Sleep Through Winter?

A few animals come close to altogether sleeping through winter, but even they usually rouse themselves every once in a while. These include ground squirrels, who enter a deep state of inactivity called aestivation during periods of drought; bats, which may enter a similar state called suspend animation if they become too dehydrated; and some species of snakes and lizards, which can enter brumation (a type of aestivation that reptiles undergo) if conditions are too hot or dry.

How Long Do Animals Hibernate For?

While some animals only hibernate for a few days or weeks at a time, others can stay in their dens for months. For example, ground squirrels typically emerge from hibernation in early springtime, while brown bats usually don’t leave their roosts until late spring or early summer. Even within a single species, there can be significant variation in how different long individuals spend in hibernation.

Bears are some of the longest-hibernating animals, with some species (like the black bear) remaining asleep for up to seven months! Bears usually don’t stay in their dens for the entire winter; they typically wake up every few weeks to move around, urinate and defecate.

What Happens If Animals Don’t Hibernate?

If animals don’t hibernate, they can face some pretty severe consequences. For example, many animals rely on the fat they store up during autumn to get them through the winter months. If they don’t hibernate and conserve their energy, they may not have enough fat left to last them until springtime. Additionally, animals that don’t hibernate are more likely to succumb to predators or inclement weather.


Although it’s commonly thought that animals sleep through the entire winter while hibernating, that’s not always the case. Instead, most animals only enter a state of light sleep called torpor, from which they can easily be awakened if necessary. The main reason for this is food availability; if there’s not enough food around to support an animal’s energy needs, it makes sense to conserve what little energy is available by entering a state of torpor. Additionally, by emerging from their dens periodically during winter, animals can take advantage of brief periods of warm weather to forage for food or mate.