[iainctduncan]

Regardless of the sleep effect (or lack of) they absolutely do work for reducing eye strain for migraineurs.

It's noticeable to me all the time, but if I'm borderline migraining, or recovering from a migraine, the difference between shifted and not is something I can feel instantly. Shifting all the way over enables me to eek out some work after a migraine without it flaring back up again.