Drainage: There are many reasons for this in morning but it could be drainage down your throat and nasal passageway while you sleep. When you wake you cough or spit or it could initiate the gag reflex thus making you feel like throwing up.
Answered 8/28/2018
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Post nasal drip: Post nasal drip can build up in your throat while sleeping. Spitting up the mucous, or coughing it up when you arise is common. Try a decongestant, either nasal or oral, before retiring, and see if things improve!
Answered 3/26/2013
5.3k views
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