NancyLebovitz comments on Thoughts on designing policies for oneself - Less Wrong
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There's a program called f.lux that you can download on a computer/laptop, and it senses your current location, looks up time of sunrise and sunset, and changes your screen to warm hues only after your local sunset. It's not distracting at all–I only notice it if I actually see the transition happen. However, I don't know if it makes any difference.
I also turn the screen brightness down if I'm on the computer right before bed, i.e. now.
I tried f.lux, but hated the color change with a passion. As usual, there's a lot of individual variation-- I notice colors a lot in general. Do you?
I use Redshift, and while I do notice the change (so it'd be impossible for me to tell how much of the insomnia-preventing effect is due to placebo), it doesn't bother me at all.
(Edit: BTW, with Redshift the transition is gradual throughout the day, rather than near-instantaneous at sunset and sunrise.)
f.lux offers fast (20 seconds) and slow (60 minutes) transitions.