Getting a good night’s sleep tonight could guard children against weight gain in the future. According to a new study, putting preschoolers in bed by 8 p.m. could reduce their chances of becoming overweight or obese later in life by half. Preschoolers are children around the age of 4 or 5. The term ‘obese’ refers to calculations of your Body Mass Index, what doctors call BMI. They use a person’s height, weight and age to assess their amount of body fat. BMIs help tell whether a person is underweight, normal, overweight or obese. The World Health Organization says obesity can lead to serious long-term health problems like diabetes, heart disease and stroke. Researchers from the Ohio State University’s College of Public Health have found that young children who go to bed after 9 p.m. are twice as likely to be obese later in life. The researchers wrote their findings in The Journal of Pediatrics.