The pet has a temporary loss of nerve and muscle control. When it appears as if pets are sleeping with the eyes open, it is no cause for alarm. While most humans close their eyes while sleeping, not all dogs and cats do. Although some breeds of dogs and cats are more prone to sleep with their eyes open, it is not uncommon for any breed to sleep this way. In most cases, this is a defense mechanism that pets retained from their wild ancestors.
It is normal for many dogs to sleep with their eyes open. However, talk to your veterinarian if you notice your pet sleeps with open eyes.
Sleeping with the Eyes Open Affects