The body sleep cues in our circadian rhythms are naturally tuned to sunrise and sunset. If you're not experiencing a lot of sunrises, sometimes you miss out on some of the sleep benefits for that or the wakefulness benefits if earlier in the day. So red light in the morning and then flipping it on again at night can be really good for circadian rhythm. About 20 minutes a day is adequate for the use of these red lights; more is not necessarily better.

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