What Causes Discomfort Breathing While Sleeping?

last night i was trying to sleep and began to notice its uncomfortable to breath sorta like im not getting enough oxygen but i blew it off as my nose just being stuffy. But when i woke up this afternoon i took a benadryl and my nose cleared up and im completely exhausted even after 9 hours of sleeping i feel like sleeping but cant and as im laying here i have that uncomfortable breathing again little check pains here and there but when i got up i Feel fine . I checked my pulse laying down and it was 74bpm. Is this someonething i should see a doctor about ?