Phlegm in the throat has many reasons.
If it is trickling down from behind the nose then u could have some sinus issues but you did not mention any in your problems.
If you have a sticky phlegm in the throat you could be a mouth breather by night and hence dry throat causes such symptoms. also Acidity can cause the same.
Visit an ENT and check if you suffer from any of the above issues
Drink frequent sips of water, don't swallow your saliva and see whether it is sticking the throat.
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