Light drives human biology. Morning light sets the daily clock. Daylight supports attention, energy, and mood. Evening darkness supports sleep. Modern routines disrupt that rhythm through indoor lighting, screens, night shifts, and rapid travel. Psychiatry sees the costs. Sleep disruption feeds anxiety. Circadian drift worsens depression. Cognitive speed and motivation fall when sleep timing slips.
How fNIRS and light therapy are shaping precision psychiatry originally appeared in KevinMD.com.
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