What causes seeing double images?
Sometimes when I don't get enough sleep, I see double images, even with one eye closed.
Is this a known problem?
I don't think this is astigmatism because it's corrected by a good night's sleep. I wondered whether it was possible for it to be brain related but had never heard of anything like it before.
I first noticed it when looking at an LED digital clock. There were two sharply visible times, one directly above the other. When I tilt my head to the right, the top line shifts to the right. Kinda weird.