One of the most powerful environmental cues that keeps our circadian rhythms synchronized and operating on a 24-hour schedule is bright light, especially sunlight.

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Bright light, especially sunlight, is a powerful environmental cue that helps to maintain our circadian rhythms on a 24-hour schedule. This is why exposure to bright light in the morning can be helpful for regulating sleep and wake cycles, while exposure to bright light in the evening can disrupt these rhythms and make it harder to fall asleep at night.

One of the Most Powerful Environmental Cues That Keeps Our