By Maureen Salamon from WebMd.Com 2020
Have you ever woken up to bright morning skies feeling energized? A big reason for your mood is the high-intensity blue light coming from the sun. Among the visible light spectrum, blue wavelengths have the most powerful effect on your sleep-wake internal body clock.
Both natural and artificial blue light can boost your alertness and mental sharpness. But too much of it may keep you awake when your body needs to wind down.
Sunlight
Need help waking up in the morning? Open the blind or get outside to feel more alert.
Light From Screens
Their “blue” light has a powerful effect on your brain. Turn them out about 2hrs before bed.
Artificial Light
Bright lights after dark signal our brain to wake up. In the evening. In the evening. Use dim light, and block outside light.

How Blue Light At Night Hurts Sleep
Your eyes aren’t good at blocking blue light. So almost all of it passes straight through to the back of your retina, which helps your brain translate light into images.
Exposure to all colors of light helps control your natural sleep-and-wake cycle, or circadian rhythm.…




