That is to say, most antihistamines can double as a sleep aid. My favorite - once identified by Wikipedia as world renowned best sleep aid - is doxylamine succinate... I think originally sold as Unisom. Walmart has it under their name but you have to look for it, in a small bottle.
Of course, to duplicate the above NyQuil add some tylenol (generic) and something for the throat if needed.
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Antihistamines you say?
Like, what you use to treat an allergy?
Hmmmmmm...
NyQuil liquid also has a very high alcohol content as its vehicle. Sorry I could not locate the exact proof, but it is (or at least was) on the order of a shot of schnapps. This helps with sleep, no doubt.
“most antihistamines can double as a sleep aid.” Yes, the ‘older’ non-selective histamine receptor products do. The ‘newer’ selective histamine-1 (H1) receptor antagonists (e.g., cetirizine) for allergies and histamine-2 (H2) receptor antagonists (e.g., famotidine) for heart burn tend to be less sedating.
Thanx bob