Nature Notebook

As we experience more gray, weather-miserable days it seems like hibernating animals have the right idea - sleep away the winter. However, sleep and hibernation are different.

Generally, hibernation is defined as a drastically reduced metabolic state. Everything, including body temperature, is lower. Sleep is considered to be a resting state characterized by changes in brain activity. Brain activity in hibernating animals is similar (although a bit slower) to that seen in animals that are awake. Although the body is still, the brain continues to work, not rest.

When this lack of brain rest reaches a certain level of deprivation, many hibernating animals use precious energy to warm their body enough to actually sleep. As much as 80 percent of their energy is used during these periods. These stints may not be enough. When most animals awaken from hibernation, they do not spring back into pre-hibernation activity levels. They sleep for a few days.

Why is sleep so important? Scientists still haven’t figured out the purpose of sleep, but they are convinced that it is necessary for all animals.

Celebrate World Snow Day with Sarett on Sunday, Jan. 21 at 2:00 p.m. by participating in different types of snow activities and experiments. Be prepared to go outside! Please call to register at 269-927-4832. Cost is Member/$5, Non-Member/$8, Children/$3.