DEAR DOCTOR K: I recently saw a headline that said children who sleep less weigh more. Is that true? How much sleep should my preschooler and first-grader get each night?
DEAR READER: I believe you're referring to a study recently published in the medical journal Pediatrics. Researchers found that children who don't get enough sleep may also have a higher risk of being overweight. Researchers from Harvard-affiliated Massachusetts General Hospital for Children kept track of more than 1,000 children from the ages of 6 months to 7 years. They asked mothers how much sleep their children got at the age of 6 months, 1 year, and then every year until the end of the study.