[bradleyland]

I was thinking the same, but you'd have the issue of spinal compression to deal with. A 10G force could easily fold your spine in half if unsupported. Even if you sit against the wall, you're going to experience a significant amount of spinal compression. Think of someone dropping a 100 lb weight on your head.

I think a good solution would be to cross your arms and place them under your head. I'd gladly suffer two broken arms to cushion the impact on my cranium.