Why sputum comes at morning time?

Sputum production is often more pronounced in the morning due to the accumulation of mucus in the airways overnight while a person is lying down. During sleep, the body’s natural mechanisms for clearing mucus are less active, leading to a buildup. Upon waking, the act of coughing or clearing the throat helps expel this accumulated sputum. Additionally, conditions like Asthma or chronic bronchitis can increase morning sputum production.