Dr. David Brownstein, M.D
Dr. David Brownstein,  editor of Dr. David Brownstein’s Natural Way to Health newsletter, is a board-certified family physician and one of the nation’s foremost practitioners of holistic medicine. Dr. Brownstein has lectured internationally to physicians and others about his success with natural hormones and nutritional therapies in his practice. His books include Drugs That Don’t Work and Natural Therapies That Do!; Iodine: Why You Need It, Why You Can’t Live Without It; Salt Your Way To Health; The Miracle of Natural Hormones; Overcoming Arthritis, Overcoming Thyroid Disorders; The Guide to a Gluten-Free Diet; and The Guide to Healthy Eating. He is the medical director of the Center for Holistic Medicine in West Bloomfield, Mich., where he lives with his wife, Allison, and their teenage daughters, Hailey and Jessica.

Tags: sleep | melatonin | insulin resistance | dr. brownstein

Negative Effect of Impaired Light-Dark Cycles

David Brownstein, M.D. By Tuesday, 11 June 2024 04:38 PM EDT Current | Bio | Archive

In all animals, melatonin levels decrease during daylight and increase during hours of darkness. That’s because light causes melatonin levels to decline.

Forty years ago, researchers reported that bright lights turned on during darkness will cause a drop in serum melatonin. A report from Northwestern University noted that moderate amounts of light exposure at night harm heart health and increase insulin resistance. The study found that exposure to moderate ambient lighting during nighttime sleep — compared to sleeping in a dimly lit room — harms cardiovascular function during sleep and increases insulin resistance the following morning.

It has been established that light exposure during daytime increases activation of the sympathetic nervous system and can increase heart rate. This study found a similar effect occurred when exposure to light occurred during nighttime sleep.

“Heart rate increases when you sleep in a moderately lit room,” the report reads. “Even though you are asleep, your autonomic nervous system is activated. That’s bad. Usually, your heart rate together with other cardiovascular parameters are lower at night and higher during the day.”

The key takeaway is that you should keep the lights off while you are sleeping. If you need some light to illuminate the floor (to avoid tripping), make sure it is dim.

Amber or red/orange light stimulate the brain less. Avoid using white or blue light.

If there is a lot of outdoor nighttime light where you sleep, wearing an eye mask or blackout shading can be good options.

© 2024 NewsmaxHealth. All rights reserved.

In all animals, melatonin levels decrease during daylight and increase during hours of darkness. That’s because light causes melatonin levels to decline.
sleep, melatonin, insulin resistance, dr. brownstein
Tuesday, 11 June 2024 04:38 PM
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