sleep children sleep sleep inglés 9 to 12 hours of sleep KidsHealth.org KidsHealth.org Lack of sleep 8 to 10 hours of sleep http://kidshealth.org/en/parents/sleep.html sleep All About Sleep 8 to 10 hours of sleep children sleep 9–12 hours of sleep inglés sleep requirements 7 to 9 hours of sleep child sleep All about Sleep (For Parents) sleep 9 to 12 hours of sleep KidsHealth.org “For Parents: All About Sleep” inglés KidsHealth.org sleep sleep All about Sleep (For Parents) sleep 8 to 10 hours of sleep children sleep All about Sleep (For Parents) sleep inglés sleep 9-12 hours of sleep KidsHealth.org 9 to 11 hours of sleep Kidshealth.org typical sleep needs All about Sleep (For Parents)