If you have been experiencing a dry and deep cough, especially at bedtime for several months, it is important to consult a doctor. A persistent cough could be a symptom of various respiratory conditions, such as a cold, reflux, asthma, allergies, or more serious respiratory infections. It is not recommended to self-medicate with over-the-counter cough syrups containing antitussives if your cough has been lasting for months. It is essential to investigate the underlying cause of your prolonged cough through a medical consultation. We hope this information helps you find the appropriate care for your condition. If you have any further questions, don't hesitate to reach out for assistance.