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I would hesitate putting my head against a flat surface, maybe sitting down would be a better alternative assuming that a few broken bones are OK but serious head trauma is a lot worse.

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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.

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