[xnickb]

does it ease the strain on the eyes? I believe that's individual and hard to measure.

If it helps OP then I see no issue with it being useless for sleep.

I tried using f.lux a decade ago or so. Deemed it not helpful for myself

[tptacek]

It was extremely helpful to me, to the point where I could pinpoint basically all my insomnia nights (retroactively, not the night they happened) to accidentally turning F.lux off. But the research on it seems pretty clear, so I'm convinced it's just a potent placebo effect. There's nothing wrong with that!