The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
The important point to understand is that early in the day, your central circadian clocks and all these mechanisms are looking for a lot of light. I mean, they don't have a mind of their own, but it needs a lot of light to trigger this daytime signal, alertness et cetera.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
So, now, if we include these other effects of light, that's why I prefer to still get a lot of light in the day. I don't want to be in very dim light condition throughout the day.
However, you said, it's also a good idea to get as much bright light during the day as you safely can, in order to improve your mood independently of regulating your sleep-wake cycle.
It may affect your alertness level, which is going to allow you to learn better. It may affect your homeostatic drive, maybe your homeostatic factor would go higher so you could sleep earlier.
You really want to just modulate across the 24 hour cycle where it's very bright, as bright as safely can be early in the day so that you are alert. You can do your focus detailed work in that first phase
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.