Anyone know of an over the counter suppressant to knock me out for a night's sleep? Stupid tickly cough in violent fits thru the night for several nights; have tried decongestant to dry up all the horrid post nasal drip that's causing it but no success yet. Thick clear mucus running down back of throat for a week, tongue/mouth foul. Often get sinus problems but just want a night's respite from the cough.