I m curious if this is something I should be immediately concerned about. I was close to sleep, lying on my side with my head slightly propped up, and suddenly my body seemed to enter paralysis and I could only move minimal muscles in my neck and head. It felt like the air was being sucked out of my lungs as I breathed in and I was perhaps hyperventilating but reverse, as I could not get air into my lungs. It was all very sudden, and I couldn t fix it until I turned my head to the right enough to stop whatever it was from happening. It felt like about 15 seconds and has never happened before. This was around 5 days ago.