Ferrets spend 14 to 18 hours a day sleeping and are naturally crepuscular. They usually sleep in two to six hour periods. Though ferrets sleep more than most other domesticated animals, they are very active when awake and will seek to be released from their cage to get exercise and satisfy their abundant curiosity daily.

Ferrets are energetic, curious, interested in their surroundings, and often actively solicit play with humans, having a repertoire of behaviors both endearing and difficult for some human owners. Play for a ferret will often involve hide-and-seek games, or some form of predator and prey game in which either the human attempts to catch the ferret or the ferret to catch the human.

They also have a strong nesting instinct and will repeatedly carry small objects or food to secluded locations. Ferrets will seemingly form attachments to certain objects and will repeatedly seek out and "steal" the same object and bring it to their hiding place.