how many hours of sleep are needed by the average teen
1 Infants (3-11 months) need 14-15 hours. 2  Toddlers (12-35 months) need 12-14 hours. 3  Preschoolers (3-6 years) need 11-13 hours. 4  School age (6-10 years) need 10-11 hours. 5  Adolescents (11-18 years) need 9.25 hours. 6  Adults need an average of 8 hours.  Elderly adults may need less sleep.