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Doug's avatar

For those who like words: Animals that are most active at dawn and dusk are crepuscular, which can be further divided into matutinal (dawn) and vespertine (dusk).

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Bruno's avatar

I don't understand how the darkness part of entrainment works. I'm in mediterranean, daytime duration ranges from roughly 16 hours in the summer to just under 9 hours in the winter. If that had major influence, it seems like it would just be messing the rhythm up.

But then, if it's only (or mostly) about morning sun exposure, daylight saving time would not be such a big deal (if you don't wake up at sunrise, which I guess most people don't?). The clock shifts, you wake up with an alarm clock an hour earlier, and then you immediately get sunlight exposure at waking time, just as you would if you traveled.

Maybe I'm out of touch and most people don't actually get up more than an hour after sunrise? But when the clock shifts forward in March, the sunrise is around 5:40 (shifting to 6:40 next day). If you get up at 7, you should be good.

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