A frequent dry night cough, especially with weather changes, is very common and often triggered by dry air, mild allergies, or post-nasal drip. To relieve this, you can try an over-the-counter antihistamine like cetirizine or loratadine before bed to reduce throat irritation. Alternatively, a cough suppressant containing dextromethorphan can help quiet the cough reflex. Simple home remedies are also highly effective: try using a cool-mist humidifier in your bedroom, elevating your head with an extra pillow, and drinking warm water or taking a spoonful of honey before sleep. If the cough persists for over three weeks or is accompanied by wheezing, please consult a doctor.