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I used to have that when I was a teenager. About one out every ten times I was falling asleep just at the moment I drifted off I'd feel this crazy big pop that went from deep behind my right eye to the top right part of my skull. Sometimes it was more like a noise, sometimes it was more like a physical impact, like somebody bounced a golf ball off of my skull. It was really annoying. It started to happen less and less as I got older though. It pretty much went away completely by the time I was in my late 20s.
Always felt like an increasing rush of wind to me. Like falling faster and faster.
I get that as well! When it’s not a horrifyingly loud boom, it’s like an increasingly loud wind sound. When I get that one, it’s accompanied by my body feeling like I’m in a wind vortex being whipped around every direction. Makes me scared to go back to sleep.