I've just done another overnight, and yet again row 53 was relatively sparsely populated compared to the rest of the cabin. 53J was empty, and the passenger in 53F asked to be moved (and was found another seat). I think that word may be getting around about how noisy 53 and 56 can be.

The silver lining is that 52A and 52K can therefore often get out without having to step over anyone.