Do any of you guys ever get vertigo (at least I think it's vertigo) when you're fairly high and close your eyes? When I'm pretty stoned I can close my eyes and concentrate on balancing my head right in between my shoulders. When I let it slip forward or back a little, It feels like I'm falling and spinning at the same time until like a shiver goes over my whole body and everything is still again. I do this just about every time I smoke, but none of my friends know what the shit I'm talking about. Any of you experienced this?