They probably have a headache, part of the "hangover" you get if you drink too much, and they are probably taking aspirin or some other headache medicine. "After a night of drinking" sounds perfectly natural to me!
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Grammar GeekThey probably have a headache, part of the "hangover" you get if you drink too much, and they are probably taking aspirin or some other headache medicine.
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Grammar GeekSorry, I didn't realize what the actual area of confusion was.
The morning after a night of drinking.
Use "the" with morning because there is only one morning that follows any particular night. Use "a" with the night because until it was mentioned (in that sentence) it was not predefined.