Coughing caused by asthma is often most prevalent at night, usually manifesting as a dry cough that does not expel mucus. This symptom can disrupt sleep, leaving affected individuals fatigued the next day. Experts have yet to reach a consensus regarding what exactly causes the cough to worsen during the night. Some theorize it may be a result of increased exposure to allergens, the position in which one sleeps, or hormones secreted at night.
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