Our circadian rhythms sync to the day/night cycle, which is sensed by changes in light levels. Sunrise is a major driver of that, and so syncing our schedule to sunrise works out well biologically for us.
If the day is synced to solar noon, so that the time we need to wake up relative to sunrise changes throughout the year, then we may need to work to keep circadian rhythms synced to our schedule. For parts of the year where our wake up time is significantly after sunrise, we may need to block sunlight from our sleeping rooms. For parts of the year where we need to well before sunrise, we may need to have bright lights with the appropriate spectrum go off when it is time to wake up.
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Our circadian rhythms sync to the day/night cycle, which is sensed by changes in light levels. Sunrise is a major driver of that, and so syncing our schedule to sunrise works out well biologically for us.
If the day is synced to solar noon, so that the time we need to wake up relative to sunrise changes throughout the year, then we may need to work to keep circadian rhythms synced to our schedule. For parts of the year where our wake up time is significantly after sunrise, we may need to block sunlight from our sleeping rooms. For parts of the year where we need to well before sunrise, we may need to have bright lights with the appropriate spectrum go off when it is time to wake up.