Cats can conserve energy by sleeping more than most animals, especially as
they grow older. Durations of sleep are various, usually 12–16 hours, with 13–14
being the average. Cats, in some cases, can sleep as much as 20 hours in a
24-hour period. The term cat nap refers to the cat's ability to fall asleep
(lightly) for a brief period and has entered the English vocabulary – someone
who nods off for a few minutes is said to be "taking a cat nap".
Due to cats nocturnal nature, they are often known to enter a period of
increased hyperactivity and playfulness during the evening, dubbed the 'evening
crazies', 'night crazies' or 'mad half hour' by some (but not 'happy hour').
Sleepy Cat Video
Cats' temperament can vary depending on the breed. Shorter haired cats tend to
be skinnier and more active. Cats with longer hair tend to be heavier and
The body temperature of a cat is between 38 and 39 °C (101 and 102.2 °F).
A cat is considered febrile if it has a temperature of 39.5 °C (103 °F) or
greater, or hypothermic if less than 37.5 °C (100 °F). A domestic cat's
normal heart rate ranges from 140 to 220 beats per minute which is largely
dependent on how excited the cat is. Cats at rest have an average
heart rate between 150 and 180 bpm.