What can I do to prevent waking up nauseated and vomiting? Gastric Sleeve 8 months

(Gastric sleeve patient 8months) Lately about 3 times n the last 4 months I have awaken in the morning feeling nauseous and actually vomited. I drank water when I got that naseau feeling when I got up so that's what I threw up. The first time I did throw up something that could have been food. Why did I wake up feeling that way? How can I stop that from happening?

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