How can I sleep better after my septoplasty/rhinoplasty?

Post op 4 days from this surgery. My question is I cannot sleep since I have been home on the surgery. Everytime I fall asleep whether in a chair, elevated on a pillow etc, after 3-5 min, I hear like a pop in my mouth breathing and wake up. The pop is loud. It almost seems like I am gasping for air for a quick second. This happens continuously every few min and I cannot sleep. Called surgeon and he suggested Nyquil. Tried that but it was worse.