Are humans that sensitive to a shift in daylight?

Apparently so.  Mental depression rises when returning to standard time, which moves 1 hour of daylight from the afternoon (5:00-6:00 PM) to morning (7:00-8:00 AM).  [Science Daily Oct 27, 2016] There is a connection between sunlight and mental depression.  Since sunlight produces vitamin D in human skin, one would expect to see more cases of mental depression in sunlight-deprived individuals.  This is the case. [Journal Affective Disorders July 1, 2016; Journal Nutrition Science Nov 20, 2015]

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