No coughing at night can suggest several possibilities which have more bearing on your day time routine. Your day time environment could have a smell or irritant that causes an immediate cough response (eg. perfume, ammonia or chlorine). The obvious treatment is exposure avoidance when possible. Swallowing disorders can allow small amounts of liquid and food into the windpipe causing prolonged coughing. Finally anxiety or stress related coughing can be a sole cause of a daytime cough however this generally contribtes as a secondary role (eg. business meetings and public speaking).