that blind headrush is nothing more than blood storing up in your legs or what not, then suddenly being able to rush back to your brain, its more frequent with stoners because we have naturally lower blood pressure, so it can rush to our brain all at once, if you simply getup slowly you wont get a headrush

which reminds me, has anyone played space monkies before? it seems like noone but a few people i know have even heard of it before