It is normal for cats to not close their eyes tightly when sleeping. Many cats will have this situation. This is a habit. Before cats became human pets, they were very alert when sleeping. Most of the sleep is light sleep, so some eyes are not completely closed, but half-open.

Tip:

We should not disturb cats after they are asleep. After all, cats only sleep for a few hours a day. It is hard-won and we should not wake them up at will.