Cats’ natural activity patterns might appear to humans to be sleep disorders, but some serious medical problems can disrupt cats’ sleep, reports Catster.

Do cats suffer from true sleep disorders and insomnia? The short answer is that nobody knows for sure. I am not aware of any electroencephalographic studies of cats during sleep. And I rather doubt that cats lie awake at night worrying about their big meeting the next morning, or about whether they made a fool of themselves during the previous night’s date. Nonetheless, the existence or nonexistence of true sleep disorders in cats is an open matter at this time.