Hi, This seems to be continued rhinitis along with sinusitis hence when you lie down the fluid from sinuses escape through the opening due to changes posture and cause post-nasal drip. This irritates the already inflamed throat mucosa to cause violent coughing. Hence I would advise you the following: - Consult your Doctor for preliminary examination, investigations like that of blood and X-ray of sinuses in standing position to see for any air-fluid level - Get started on primary treatment like Nasal decongestant drops - Steam inhalation - Oral decongestant and anti-inflammatory medicine like Ibuprofen if it suits you - Antibiotic will be prescribed if your doctor feels so - Do these thing before sleep to have proper drainage of sinuses so that the sinus discharge is reduced and you get sleep - Try to sleep on sides - Consult an ENT surgeon for further evaluation, investigations and any additional treatment if the primary treatment fails to relieve your symptoms Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. T. Chandrakant, General Surgeon