Why teens need up to 10 hours' sleep
February 21, 2018, Flinders University
Technology, other distractions and staying up late make is difficult, but researchers say teenagers need to make time for 8-10 hours of sleep a night to optimise their performance and maintain good health and wellbeing.
As soon as teens get less than nine hours sleep, attention deficits accumulate and jetlag-type behaviour starts to kick in – putting them at risk of poor performance at school and even personal injury through accidents, including car crashes if they drive.
https://medicalxpress.com/news/2018-02-teens-hours.html