Blame science – and not your teenager – if they’re slow starters in the morning.
Teenagers just can't get eight hours of sleep if high schools starts much before 8 a.m.
University of Minnesota researcher Kyla Wahlstrom said that's because adolescents go through something called the sleep phase shift.
"Teenagers are basically unable to fall asleep on a regular basis every night,"Wahlstrom said, "say, before 10:45 or 11. It’s just a biologic almost impossibility.”