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 synchronize our circadian rhythms to a 24-hour schedule. This is why exposure to bright light in the morning and avoidance of bright light in the evening can help to regulate our sleep-wake cycle.

One of the Most Powerful Environmental Cues That Keeps Our