Natural rhythm and virtue

Laurie from Body Impolitic is a working artist. She says she is lucky she has been able to be self-employed all her life. She also happens to have a circadian rhythm that is different from most. She wakes up around 1 in the afternoon, works and interacts and creates. Her bedtime is around 3 a.m. or later.

She wonders why people who get up at the crack of dawn tend to look down on late-sleepers. Is there really a virtue implicit in getting up so early? One could look at the body of her work as an artist and as a human being, and say she has been quite productive. Sure she starts later in the day than most, but by the same token, she works well into the night when everybody else has given up and gone to bed. Why is her natural rhythm inferior to the day-worker's?

Maybe the crack of dawn virtue is a holdover from our agrarian days. But we're not farmers anymore. It's worth thinking more about.