According to German sleep physicians, our bodies are out of synch with the world we now live in resulting in social jet lag. Thanks to a mismatch of about two hours between our biological clocks and the demands of our jobs,at least half the population feels sluggish,disoriented and dazed. They say the solution is to match natural sleep rythms with daily routine – the average person prefers to sleep between 12midnight and 8.30am.
More examples include the need to sweat in gymns now that work is less physically demanding, or female bodies that require getting pregnant at young age while culturally many women now want to have children later in life.
Read more about it here in article from the Observer.
NORTHERN PLANNER 
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