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This assumes people wake up at a certain time of day. ...which is entirely arbitrary.
by koheripbal 6y ago
This assumes people wake up at a certain time of day. ...which is entirely arbitrary.
- Wowfunhappy 6y agoIt's not arbitrary, it's based on sunlight. The sun sets our mental clocks. This is why a lot of people advice against using screens late at night—because they contain a lot more blue light than regular household lights, and thus throw our bodies out of balance. But, those are still much smaller light sources than the sun!