People who slept in on weekends, or those who got more sleep on weekend nights than on weekday nights, had an average body mass index of 22.8, compared with 23.1 among those who did not engage in catch-up sleep, according to a study in the journal Sleep. South Korean researchers evaluated survey data on more than 2,000 people, ages 19 to 82, and found that each additional hour of sleep on weekends was tied to a 0.12 drop in BMI.
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