Sometimes i wake up in the morning, and i have trouble breathing. my nosebis stuffy, but even through the mouth its difficult, why?

Need more info..: Several possibilities exist that can explain shortness of breath in the morning and this should definitely be discussed with a physician. One that I see commonly is allergic asthma with sensitivity to indoor allergens such as animal dander or dust mite (or outdoor if the windows are open). A discussion about timing of onset, frequency, other possible symptoms will help to begin to figure it out.