One reason that the rate of adolescent depression is so high in this country is because adolescents go to bed late. They're on their computers and their devices, which [emit] light at a particular frequency that stimulates their retinas to keep them awake. So, it's disrupting their circadian rhythm ... And then they have to get up at a really early time in the morning to get to school ... An adolescent brain needs ten hours [of sleep] a night, [but] most kids are getting five [or] six hours. That's really bad.