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.
So let's say you fly from New York at night. You reach Italy at eight o'clock in the morning. What is the time in your New York time although you- - Six hours back. - Six hours back. - It's 2:00 in the morning. - It's 2:00 a.m.. So when you land Italy, you want to avoid light like the plague.
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And so if you're looking at the Italian sunrise, having just flown from New York to Italy and you didn't prepare for that trip by waking up a little bit earlier in anticipation- - Multiple days, yeah. - And you view light at 6:00 or 7:00 a.m. Italian time, beautiful Italian sunrise, you are going to delay your clock. You're going to basically throw yourself back to California, but you are in Italy. You're going to throw your biology back to California and you are going to be up in the middle of the Italian night. And you're going to be miserable-
So you could do it for every region. You could calculate how much they are advanced of you. You could know how much these light shifts happen per day, and you can calculate what you need to do, very simple math, to adjust either in direction of delaying if you're going from New York to California, you want to delay your clock or advancing if you're going from New York to Italy.
So, let's say you fly from New York at night. You reach Italy at 8:00 in the morning. What is the time in your New York time? You although you reach >> 6 hours back >> 6 hours. It's 2:00 a.m. >> So when you land Italy, you want to avoid light like the plague.
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.