cough
"I usually get a persistent cough when I come down with a head cold.  So, just before bed I take 5 ml ( 1 teaspoon ) measured carefully.  Fortunately, none of the stomach side effects (which seem to be more common with higher dosages.)  During the day I live with the cough, which I understand is somewhat necessary to clear the lungs.  If I didn't take anything at all I would never get a proper night's sleep when I needed it the most - to recover from an illness."