Cats may sleep with their eyes open due to a lack of security. This is because they are more sensitive and easily startled, and they are often in a state of alertness in order to react quickly to any unexpected situations.
It's also possible that this is just a sleeping habit of the cat, just like some people sleep with their eyes open, and there's nothing wrong with it. Owners should spend more time with their cats to give them a sense of security. Sensitive cats need even more care and love from their owners to grow up healthier and happier.
