Recently I went out in a kayak for an evening paddle. It was delightful and unremarkable from a vertigo perspective – except for one thing. As the sun set, I noticed that I felt unsteady when I turned my head. I guessed that, in the dim light, my eyes were not getting enough visual information to compensate for the rocking motion of the boat. I stopped turning my head – or at least not as quickly – and after awhile everything seemed back in calibration.