Why am i waking up in the night gasping for air?

Its very scary and its happened more than once, ive woken up in the middle of the night and i cant breathe. I start coughing and its like the saliva is choking me so i try to breathe through my nose. Its terrifying, and i dont know what it is. But its not only when i sleep, sometimes if im just laying down. Also at... show more Its very scary and its happened more than once, ive woken up in the middle of the night and i cant breathe. I start coughing and its like the saliva is choking me so i try to breathe through my nose. Its terrifying, and i dont know what it is. But its not only when i sleep, sometimes if im just laying down. Also at times whenever i just move my kneck i start coughing. Im really scared.
5 answers 5