The Evening Crazies is behavior during which domestic felines (cats),
as well as
kittens, enter a period of increased
hyperactivity and playfulness. Since cats are nocturnal predators, it is
normal for them to be active late at night. Although the "evening
crazies" are most commonly witnessed during the evening
hours (hence the name), cats can actually experience the evening crazies
at any time, although the vast majority of cats sleep during the day.