Worsening at night and difficulty sleeping are common with cough associated with upper respiratory infection and could be caused by exacerbating factors such as dry air or postnasal drip.

• 夜间加剧和睡眠困难，在咳嗽合并上呼吸道感染病人中常见，可能由加重因素如干燥或后鼻滴涕引起。