Dogs may like to lick before they go to sleep because it stirs latent memories of when they were puppies. Your dog having a lick before he goes sleep could mean hes just sorting out his own personal hygiene in-between times.
Why do dogs lick your face when you sleep?
Well, apart from greeting you with a “good morning” or “hello,” dogs will lick your face simply because… they like the way you taste. Your skin secretes sweat and oil during sleep and your pup may become very drawn to the taste of salty skin. So he jumps right at your face, trying to shower you with his affection.
Why do dogs want to lick your face?
Whether you love it or hate it, dogs love to lick faces, its a fact and the more excited they are or the younger they are, the more they love to use their tongues. Whilst humans would associate this oral fixation with affection, its important to remember your dog doesnt have the same thought process as you.