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Originally Posted by daionara  I knew the exposed belly means they feel safe but if you look at her face...her eyes are open. She ALWAYS seems to have at least one eye showing the white when she is on her back. Not gonna lie, little bit icky. |
Busters eyes open and close when he is sleeping it's part of the REM (Rapid eye movement) cycle I believe. I just looked it up here you go.
Do Dogs Close Their Eyes When They Sleep? | Dog Care - The Daily Puppy