Various studies have shown a connection between regulatory problems in infancy/toddlerhood with behavioral problems and attention deficit/hyperactivity disorder (ADHD) in childhood.
Nokkrar rannsóknir hafa sýnt samband á milli svefnvanda, óværðar og endurtekinna sýkinga frá 0-2 ára aldurs og hegðunarvanda og ADHD seinna í barnæsku.