Sun W, Kwok NTT, Chan NY, et al. - Researchers investigated if and how circadian characteristics (ie, chronotype and social jetlag) associate with insomnia symptoms and emotional and behavioral problems among school-age children. They recruited 620 primary school children (Mage = 10.06, SD = 1.16, 58.7% boys) and assessed them by a set of parent-report questionnaires, including Children’s Sleep Habit Questionnaire for determining sleep-wake patterns and insomnia symptoms (bedtime resistance, sleep onset delay and night waking), Children’s Chronotype Questionnaire for determining the child’s chronotype preference, and Strength and Difficulties Questionnaire for determining emotional and behavioral problems. Per findings, risk factor for insomnia symptoms was evening chronotype, but not social jetlag, and there was further correlation of evening chronotype with increased behavioral problems in school-age children. Hence, the roles of circadian factors were emphasized herein in relation to sleep and mental health problems in this young population.