hibernate

To spend the winter in a dormant or inactive state of minimal activity, low body temperature, slow breathing and heart rate, and low metabolic rate; to go through a winter sleep.

Hedgehogs and bears are two of the many mammals that hibernate in winter.

Organisms have developed all sorts of ways of dealing with these variations. They hibernate or estivate or migrate.

To live in seclusion.

To enter a standby state which conserves power without losing the contents of memory.

Your computer hibernates after it has been idle for the specified amount of time.