I woke up this morning at 5am, sat straight up in bed out of a dead sleep, unable to breath. Lungs were not working. I gasped 3 or 4 times, and finally punched myself in my chest and they started working again. Was not like asthma or wheezing, was lungs completely not working. Ran to the bathroom shaking, lips, fingers were blue. Also have a pounding headache. Has happened 3 times in the last year. I am overweight, but I do not snore, and doesnt sound like sleep apnea. Normally sleep on my side like a log, barely moving during the night. Possible cause?