So my biggest issue here is the artificialness of the wake up time given how much change there is in sunlight during the course of a year. And given clocks are

So my biggest issue here is the artificialness of the wake up time given how much change there is in sunlight during the course of a year. And given clocks are a very recent invention it seems to be the odd one to chose. It can be well and truly light and sunny or pitch dark for another hour or more at 6am depending on the time of the year. In general I think it's great you moved your sleeping cycle closer to sunlight sundown than before and am not surprised you feel much better. I just am reticent to get into the hard "clock" game as it's such an artifical, new event for humanity.