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You’ll think twice about burning the midnight oil after watching our first story. As Americans sleep less and less, scientists are discovering that sleep is far more critical to human health than previously believed. Serious problems such as diabetes, obesity and heart disease are being linked to sleep deprivation. And, as correspondent Lesley Stahl first reported last March in this double-length segment, staying up to work or study may do more harm than good. Says sleep researcher Matt Walker, "Practice does not quite make perfect. It’s practice with a night of sleep that makes perfect."

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With a good night’s sleep under your belt you may be a happier person, but probably not as happy as the Danes are. In our last story, we learn that Little Denmark, with its five-and-a-half million people, is the happiest country in the world, concludes a study by an English university. So why are they so happy, while America is far down the list at number 23?  In this surprising and humorous piece, correspondent Morley Safer tried to figure it out last February on a whimsical trip to the land of Hans Christian Andersen.

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These stories, and Andy Rooney's wealth of ideas, on Sunday’s 60 Minutes, June 15, at 7 p.m. ET/PT.