Had a visual migraine last night, so I went to bed a bit early, not quite midnight. It was a pretty spectacular light show, multicolor diamonds dancing in a shape like a script capital-Q lying on its back. Started in the upper right corner of the visual field and by the time, I went to bed it filled more than half of everything I could see. And black had been added.
Definitely time to go to bed. Got up this morning with a slight headache but no remaining visual distortions. Good enough.