‘Late to bed, early to rise’ can eventually lead to extra pounds. Babies, toddlers and preschoolers need plenty of sleep, and when they don't get enough, it takes a toll on their health. Study that followed nearly 1,050 children, starting at 6 months old.

Every year, up to age 7, mothers reported how long their children slept in a typical 24-hour period, and researchers ranked how often sleep was curtailed, a very striking relationship when children were chronically getting too little sleep in almost every single outcome you can look at for obesity. "In my own pediatric practice, when we ask about bedtimes, quite often we hear that children are going to sleep at times that are really adult times." Some 4-year-olds don't go to bed until 11 p.m. With casual bedtimes at night, but fixed start times for school or day care and for parents to be at work, there's no recovery of lost sleep…