I don't know if it's the same thing, but will it wake you up real fast when it happens? To me it always felt like I was going to throw up (no nausea, nothing comes up in throat, nothing like that, but the throat just gets this weird feeling and I jump awake), it will only happen if I am laying on 2 pillows or something to watch TV, but like you said, laying FLAT it never happens. It's such a weird feeling. It's been happening for about 15 years, now it doesn't even scare me, I get it, then just turn around and pull the other pillow out from under my head. I was then blaming it on GERD, but you describing it as a tightening of the throat was a good description. I make sure I don't have anything pressing on my throat either like pushing a blanket up around my throat, something to that affect), THAT makes it worse.