https://www.healthcentral.com/article/wake-every-morning-saliva-mouth-smells-bad-cant-swallow-it-i-spit-first-talking-years-now
GERD

Why Do I Wake up with Bad-Smelling Saliva in my Mouth?

    Answered by Stephanie
    You should know: The answer above provides general health information that is not intended to replace medical advice or treatment recommendations from a qualified healthcare professional.