Difficulty breathing in the morning due to stuffy nose. do you think dustmites, or other things?

You could try +: Stuffy nose could a viral infection referred to as a 'cold', an allergic reaction caused by something inhaled from the environment, a bacterial nasal infection called 'purulent rhinitis'. General measures include hot shower water or hot compresses over the nasal/sinus area, saline nasal spray, a mild decongestant. Antibiotic or antihistamine may be appropriate. If persistent nagging prob, c doc.