Take off your sunglasses: how light in your eyes secretly runs your hormones, sleep, and mood
About this episode
Dr. Motley discusses how light exposure affects hormones, sleep, and mood, particularly in relation to wearing sunglasses.
Should you be wearing sunglasses? We always thought the eyes just had one job: to see color and send pictures of our environment to our brains, but did you know that they also have a sensor that tells the brain when it’s time to get going for the day and when it’s time to sleep? That sensor can get disrupted when you head out with sunglasses on. In this episode, Dr. Motley weighs the pros and cons of sunglasses (at least in the morning!) by examining the science of light and circadian rhythms. In this episode you'll learn: How using sunglasses too frequently in the morning can throw our body’s natural clock out of whack and interfere with our sleep cycles. How blue light in the morning (the natural kind you see in the sky) shuts off melatonin and activates cortisol by 50%, basically functioning as a cup of espresso for our bodies, and fake blue light at night confuses our sleep signals, suppressing melatonin within about 5 minutes. How light regulates our hormones and acts as our body’s information center for when to start the day and when to get sleepy at night. The effects of sunlight deficiency on our bodies and brains. The difference between the kind of cortisol we need to…
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