My son has had a bad cold..maybe a sinus infection since Thursday. He has been on antibiotics for 4 days now. Question: He is having trouble sleeping..first it was bc his nose was stuffy..now his nose a little bit better..but he is coughing such a dry cough..it is keeping him up during naps and at nite...im waiting for a call from Dr...but do you guys know of anything to give him for this? Is this common with a cold?