Rabbits also sleep with open eyes, but not all of them and not always. In the wild, such sleep helps them be alert all the time and react to predators who come close. Pet rabbits inherited this feature. To understand if your rabbit is sleeping or just resting, take a good look. When they are sleeping, their breathing slows down, the nose stops twitching, and the ears relax.
Some dogs can sleep with their eyes slightly open. But, in fact, it only seems that their eyes are open. The white film you can see is not the eye itself but a nictitating membrane.
Horses can sleep standing up and lying down with both open and closed eyes. Half-open lids mean the animal is napping. To get good sleep, they need to shut their eyes. When sleeping, horses lift their hind legs or stand on their tips.

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