I’m back from Reading. I have performed the necessary ablutions that turn me into a human being: washing my hair turned the bottom of the shower brown. And my back is almost wholly well (if a little weak).
I can therefore recommend sleeping on the floor as a partial cure for ganglion-related lumbar pain. I can’t say I saw a need for drunken mobs and the slamming of the doors on the metal toilet block during the treatment. Perhaps it had some sort of holistic effect.