Mouth breathers : If this happens following sleep, it’s possible that you breath more through your mouth ( mouth breather ) and it’s possible that you may have obstructive sleep apnea ( someone will have to observe and see if your breathing is loud, and if it’s that is a clue): your tongue dries up during sleep and there is some build up of carbon dioxide that may contribute to headache.
Answered 3/4/2020
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