Through years of practice I've gotten faster at it, and now I can get into a reasonably deep meditation in less than 30 seconds. The problem is that after about a minute my eyes start to very painfully roll back into my head. It hurts like hell and is completely involuntary. Trying to keep them from rolling back prevents me from meditating.
I've looked around on the internet, but I've never managed to find an explanation of why that happens to me. Seems like I'm a pretty severe outlier on that one. Has that ever happened to anyone else?