Since 3-4 days when i lie down to sleep i feel that I have to stretch consciously to breathe ..it is so disturbing and frustrating that i cannot even sleep .. I consulted a GP and also took a chest xray and it came out absolutely normal .. The problem generally happens when i face exerson .. Can it be some.kind of allergy which the GP could not diagnose..wondering why is it happening as it never happened before ..when I'm sitting upright or standing then i dont feel so much need to stretch the breathing ..then it feels normal ..only while lying down it feels so.