WebMD: Nighttime Activity in Cats http://pets.webmd.com/cats/guide/nighttime-activity-cats http://pets.webmd.com/cats/guide/nighttime-activity-cats Cat Too Active at Night http://pets.webmd.com/cats/guide/nighttime-activity-cats http://pets.webmd.com/cats/guide/nighttime-activity-cats pets.webmd.com http://pets.webmd.com/cats/guide/nighttime-activity-cats Cat Too Active at Night