Use this chart to help schedule your child's bedtime routine. "Children and teens who are sleep deficient may have problems getting along with others. They may feel angry and impulsive, have mood swings, feel sad or depressed, or lack motivation. They also may have problems paying attention, and they may get lower grades and feel stressed." - https://www.nhlbi.nih.gov/health/health-topics/topics/sdd/why You might also be interested in How Much Sleep is Needed?.