One user reported his success with this method to his ENT, who informed him that he has been using this method for 35 years.
went outside to try this method (you can
do it inside, on towels) I
sat down on the ground, legs bent, knees up. I bent my head back, poured saline into my nostrils, pinched them, and did a reverse sit-up until my back was flat on the ground, and tilted my head back a little further.