Have you ever wondered why your cat chooses to run laps of the house at 3 A.M? This is in fact due to cats being 'crepuscular', meaning that they are most active at the hours of dusk and dawn. Historically, cats and all felines alike spent most nights darting through the shadows and pouncing on unsuspecting prey, which burns up a lot of energy. Despite years of domesticity, cats still retain their predatory nature and tend to sleep more during the day to conserve their energy for activities later in the night.