The return to "standard time" is better for our health according to sleep scientists, but the time change can be disruptive, and our bodies must also adjust to more hours of darkness as we head towards winter.

The body is an exquisite time-keeping machine. And growing evidence shows that if you align your daily habits with your circadian rhythms — including when you sleep, eat, and exercise — you can help fend off chronic disease and optimize good health.

Let's start with a quick primer: "Your body is filled with clocks," explains Emily Manoogian , a researcher and chronobiologist at the Salk Institute for Biological Studies. In addition to the master clock in your brain, there are time-keeping mechanisms in every organ and in your cells.

"Every cell in your body that has DNA has a

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