Any “nighttime” cold and flu medication just has an antihistamine stuffed into the normal Tylenol, Robitussin, Mucinex “daytime” combo. The daytime used to include a decongestant, but you can make meth with Sudafed pretty trivially, and the replacement stuff did fuck all, so they pulled it from the market, so now if you’re healthy just build your own: Pain meds (Ibuprofen/Acetaminophen), an expectorant (Guaifenesin, though too much can make your stomach upset which is why it’s in everything that can be abused these days), a cough suppressant (dextromethorphan, expect to have to show an ID), and a decongestant (Pseudoephedrine, it’ll be at the pharmacy and you’ll need to show ID, but you don’t need a prescription).