Question
As we know, Cats are usually active at night and sleep at noon, but I would like to play with cats at day and sleep with cats at night, is it possible to train cats to sleep at night like human?
Answer
Cats aren't actually most active at night, perse; they are crepuscular, which means they are most active in the twilight hours around dawn and dusk. This, in nature, primarily has to do with their prey; mice are also crepuscular and birds tend to be active early in the morning (E.G. the early bird, which gets the worm).
The first link also gives information on how you can attempt to change your cat's sleep schedule, but it's worth noting that the two key methods of changing your cat's schedule are the same as changing your own: Food and Activity.
Circadian rhythms are set from light exposure (modifiable via artificial light sources, but irrelevant if you're trying to make your cat sleep during the night), the availability of meals (controllable via your throttling of food bowl access -- put it down in the morning, pick it up at night), and typical activity cycles (play with your cat in the daytime; this also helps to tire your cat out for the hours you're asleep or not at home -- they have a much longer sleep time than we humans do). (Sources: Wikipedia, personal experience, various websites)
Good luck, and don't be surprised if you end up with a cat alarm clock; they tend to get pushy when their food is withheld until you're awake.
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