It likely does result in different types of work being easier to do at different types of day. Many anecdotes and productivity tips suggest finding optimal times of day to do different tasks based on your own circadian rhythms, but I think the research is still emerging in this area. Circadian rhythms vary a lot more from person-to-person than the video makes it seem, because they are regulated by various zeitgebers (e.g., sleep/wake cycle, eating times, exercise times, light exposure). For research purposes, it makes it more difficult to do analyses and determine what times are best for different tasks.
I wonder how long it takes until someone develops wearable tech that tells you the exact optimal time to work, exercise, eat and sleep. It'd be pretty nifty.
My English skills might be a bit lacking, because I've never heard of the term 'circadian rhythm' before. I always thought that the highly scientific term was 'biological clock'. :P So thanks for expanding my vocabulary!
Sorry, some jargon that slipped out from my studies, haha