As a respiratory specialist, I can provide a detailed explanation of why coughing tends to be more severe at night. The phenomenon of coughing more at night can be attributed to several physiological and environmental factors that work in tandem to exacerbate the symptoms.

Firstly, Postnasal drip is a common cause of nighttime coughing. This occurs when mucus from the nasal passages and sinuses drips down the back of the throat. The mucus can irritate the throat, causing a tickling sensation that triggers the cough reflex. This is particularly bothersome at night because we are in a reclined position, which allows mucus to flow more easily down the throat.

Secondly, humidity levels in the home can significantly affect nighttime coughing. During the day, we are often exposed to various environments with different humidity levels, which can help to dilute and clear mucus. However, at night, when we are in a closed space with potentially lower humidity, the air can become dry, making the mucus thicker and more irritating, thus leading to more frequent coughing.

Thirdly, allergies can also play a role in nighttime coughing. Many allergens, such as dust mites, are more active at night, and the immune system's response to these allergens can cause inflammation and mucus production, leading to coughing. Additionally, the body's natural circadian rhythm can affect the immune system's response to allergens, making it more sensitive at night.

Fourthly, the body's circadian rhythm itself can influence coughing. The circadian rhythm regulates various bodily functions, including the immune system and inflammation response. Some studies suggest that the body's natural inflammatory response may be heightened at night, which could make coughing more severe during this time.

Fifthly, medication effects can be a factor. Certain medications, particularly those taken for asthma or allergies, may have a diurnal variation in their effectiveness. This means that the medication might work better during the day and less effectively at night, leading to increased coughing symptoms.

Lastly, sleep position can also contribute to nighttime coughing. When we sleep on our backs, the airway can become partially obstructed, which can lead to an increase in coughing as the body tries to clear the airway. Additionally, sleeping in one position for an extended period can cause pooling of mucus, which can exacerbate coughing.

In conclusion, the increased coughing at night can be due to a combination of factors including postnasal drip, changes in humidity, allergies, the body's circadian rhythm, medication effectiveness, and sleep position. Understanding these factors can help in managing and reducing nighttime coughing.

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Postnasal drip. Sounds like: Either a dry or wet cough. It's caused by mucus dripping down your throat (due to either allergies or a cold), which tickles nerve endings, triggering coughing, Dr. Parsons says. Other telltale symptoms: The cough is worse at night; there's a tickly feeling at the back of your throat.Apr 7, 2015read more >>