As we sleep throughout the night, our salivary glands slow down (for some older people, they shut down completely!) because our brain knows we are not eating. This slowdown, combined with the constant flow of air over our palate (for those of us who are snorers or mouth breathers) makes for a very DRY environment on the tongue, within our oral cavity and in the throat (the breeding grounds of the anaerobic sulfur-producing bacteria that cause bad breath and taste disorders) read more here,

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