According to Life Hacker, tracking sleep efficiency can help improve sleep.
So why even measure sleep efficiency? In part, because people could find it helpful to track sleep efficiency over time — and see how it differs in response to changes in their own lives: “The value of that number is in whether it changes,” says Michael Twery, director of the National Center on Sleep Disorders Research at the National Institutes of Health. (And also, who wants to waste time in bed not sleeping?)
