Circadian Health Glossary
Blue Light
Blue light is a high-energy, short-wavelength light within the visible spectrum, ranging from 400 to 500 nanometers. It is naturally present in sunlight and emitted by artificial sources like LED lights, computer screens, and smartphones.
How Does Blue Light Affect Circadian Rhythms?
-
Melatonin Suppression: Blue light exposure, especially in the evening, reduces melatonin production, delaying sleep onset.
-
Circadian Regulation: Morning exposure to blue light helps reset the circadian clock, promoting wakefulness and aligning the body with the natural day-night cycle.
Why Is Blue Light Important?
-
Health Benefits: Proper exposure improves mood, alertness, and energy levels.
-
Risks of Overexposure: Excessive blue light at night can disrupt sleep and circadian rhythms, contributing to insomnia and other health issues.
-
Light Therapy: Devices like light therapy glasses use controlled blue light to regulate circadian rhythms and treat conditions like Seasonal Affective Disorder (SAD) and jet lag.
Understanding the importance of blue light and its effects is essential for optimizing sleep, productivity, and overall circadian health.