Preschoolers who habitually snore may be at greater risk of behavioral problems than other kids their age, a study published Monday suggests. Researchers found that two- and three-year-olds who snored loudly at least a couple of times per week tended to have more problems with inattention and hyperactivity. More than one-third of those “persistent” snorers were considered to be at least at risk of a behavioral disorder, like attention-deficit hyperactivity disorder (ADHD).