Harvard Heart Letter

Time-sensitive clues about cardiovascular risk

Why do heart attack rates rise on Monday mornings and the week after daylight savings time begins? Deep inside your brain is a small cluster of cells that serves as your body’s master clock. These cells govern your circadian rhythm, the 24-hour internal clock that keeps your body in sync with the day-night cycle. But nearly all your cells also have their own clocks to ensure that each one performs its unique…

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