Mental Health

Light Therapy and Circadian Health

How bright light exposure can help with seasonal depression, mood, and circadian rhythm alignment.

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Light Therapy and Circadian Health

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Light is one of the most powerful regulators of mood and body rhythms. Bright light therapy helps combat seasonal affective disorder (SAD) and improves circadian alignment.

How It Works

  • Human body clocks run slightly longer than 24 hours
  • Morning light resets the circadian rhythm
  • Bright light suppresses melatonin, boosting alertness

Using Light Therapy

  • Choose a light box emitting 10,000 lux
  • Sit about 30 minutes each morning
  • Position it at a downward angle toward the eyes (avoid direct glare)
  • Adjust session time: increase if no benefit, reduce if jittery

Research Highlights

  • Improves SAD symptoms within 1–2 weeks
  • Comparable effect to antidepressants in some trials
  • May also help with non-seasonal depression and sleep disorders