PREVIOUS QUESTION:

 

NEXT QUESTION:

 

What is blue light?

ANSWER

Blue light has the most power among the spectrum of visible lights to affect your internal sleep-wake body clock called circadian rhythm.

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.

From: How Blue Light Affects Your Sleep WebMD Medical Reference

SOURCES:

University of California, Davis Health: “Is Blue Light from Your Cell Phone, TV Bad for Your Health?”

American Academy of Ophthalmology: “Should You Be Worried About Blue Light?” and “Should You Use Night Mode to Reduce Blue Light?”

American Optometric Association: “In the Dark on Blue Light?”

Proceedings of the National Academy of Sciences : “Evening Use of Light-Emitting eReaders Negatively Affects Sleep, Circadian Timing, and Next-Morning Alertness.”

Harvard Health: “Blue Light Has a Dark Side.”

Chronobiology International : “Amber Lenses to Block Blue Light and Improve Sleep.”

Molecular Vision : “Effects of blue Light on the Circadian System and Eye Physiology.”

International Society for Chronobiology : “Amber lenses to block blue light and improve sleep: a randomized trial.”

PLoS One : “Blue-Light Filtering Spectacle Lenses: Optical and Clinical Performances.”

Journal of Psychiatric Research : “Blocking nocturnal blue light for insomnia: A randomized controlled trial.”

Reviewed by Carmelita Swiner on February 19, 2020

SOURCES:

University of California, Davis Health: “Is Blue Light from Your Cell Phone, TV Bad for Your Health?”

American Academy of Ophthalmology: “Should You Be Worried About Blue Light?” and “Should You Use Night Mode to Reduce Blue Light?”

American Optometric Association: “In the Dark on Blue Light?”

Proceedings of the National Academy of Sciences : “Evening Use of Light-Emitting eReaders Negatively Affects Sleep, Circadian Timing, and Next-Morning Alertness.”

Harvard Health: “Blue Light Has a Dark Side.”

Chronobiology International : “Amber Lenses to Block Blue Light and Improve Sleep.”

Molecular Vision : “Effects of blue Light on the Circadian System and Eye Physiology.”

International Society for Chronobiology : “Amber lenses to block blue light and improve sleep: a randomized trial.”

PLoS One : “Blue-Light Filtering Spectacle Lenses: Optical and Clinical Performances.”

Journal of Psychiatric Research : “Blocking nocturnal blue light for insomnia: A randomized controlled trial.”

Reviewed by Carmelita Swiner on February 19, 2020

NEXT QUESTION:

How does blue light hurt your sleep?

WAS THIS ANSWER HELPFUL

"ALEXA, ASK WEBMD"

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.