Poor sleep affects 70 million Americans. Red light therapy may help improve sleep quality through circadian rhythm regulation.

How RLT Affects Sleep

1. Melatonin Support

Red light (unlike blue light) doesn’t suppress melatonin. Using red light in the evening:

  • Preserves natural melatonin production
  • Supports sleep onset
  • Doesn’t disrupt circadian rhythm

2. Cortisol Regulation

Morning RLT helps regulate cortisol:

  • Proper cortisol peak in the morning
  • Gradual decline throughout the day
  • Low cortisol at bedtime = better sleep

3. Relaxation Response

Red light therapy promotes relaxation:

  • Reduces muscle tension
  • Calms the nervous system
  • Promotes parasympathetic activation

Research Findings

2019 Study (Nature and Science of Sleep):

  • Red light therapy improved sleep quality in athletes
  • Increased melatonin levels
  • Improved sleep onset latency

2012 Study (Journal of Athletic Training):

  • Red light therapy for 14 days
  • Improved sleep quality and duration
  • Enhanced endurance performance

Protocol for Sleep

Parameter Recommendation
Timing Morning (for circadian regulation) or evening (for relaxation)
Wavelength 660nm (red light)
Duration 10-20 minutes
Frequency Daily
Distance 6-12 inches

Best Practices

  1. Morning RLT — Best for circadian rhythm regulation
  2. Evening RLT — Use dim red light only (no bright panels)
  3. Avoid blue light — In the evening, use blue light blocking glasses
  4. Consistency — Daily use for best results