Now there's another sort of central tenet of getting great sleep and improving mood and focus throughout the day. And that's to avoid bright artificial light exposure to your eyes between the hours of about 10 PM to 4:00 AM.
The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Now there's another sort of central tenet of getting great sleep and improving mood and focus throughout the day. And that's to avoid bright artificial light exposure to your eyes between the hours of about 10 PM to 4:00 AM.
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So a very simple yet powerful solution that supported by peer-reviewed research in humans is to try and make your indoor working and/or home environment during the day as bright as possible. ... And then much dimmer from the hours of 6:00 PM until bedtime. Or if you can't do that, then maybe as soon as you get home from about 8:00 PM until bedtime. And then dim them way, way down between 10:00 PM and 4:00 AM or off entirely. That's going to be a far better pattern for your sleep-wake cycles, focus, mood, et cetera than what most people do, which is to have a few windows in their indoor working environment during the day and keep the indoor lights rather dim at a time when they need more photons, more light energy. And then in the evening, when they get home because it's dark outside, they tend to turn the lights much brighter. You actually want to do the reverse.