How to Manage Light in a Dark Environment

A light does half of the job and then the other half is done by food. You brought up the example of stress hormone cortisol. Cortisol is regulated by a circadian clock, but at the same time, we know it's a stress hormone. So if you have stress in the middle of the night when cortisol is not supposed to be high, it will not just wait for the morning time. Your cortisol will go up and we know that. Similarly, the master clock sends the signal that when it should be day, when we should be eating and when we should been fasting. And accordingly, the liver clock, the gut clock, all these clocks, the time themselves.

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