You are an ocean. You’re about 60 percent plain water, with an admixture of chemicals that approximate the sea in which your most ancient ancestors evolved. Also like the sea, you are tidal. You ebb and flow. Your heart and lungs continuously contract and expand.
Your circadian rhythms alternate between alertness and sleepiness. You also have ultradian rhythms, multiple physical systems that ebb and flow within each day. Ultradian rhythms control things like your hormonal levels, heat regulation, appetite, and nostril dilation. (Yes! Nostril dilation!)
Unfortunately, you’ve had your natural rhythms disrupted by a culture that praises you for working continuously, [...]