Adolescents need at least 9.25 hours of sleep per night but their biological clocks shift, delaying melatonin secretion by up to an hour compared to younger adolescents. Research shows adolescents who get 7 hours or less of sleep per night are more likely to engage in delinquent acts, while those getting over 8 hours report feeling tired, cranky, and irritable. Tips for adolescents to get better sleep include establishing a bedtime routine, limiting stimulants and screens before bed, having a relaxing bedtime environment, and starting school later in the morning.