Researchers found that teens with late bedtimes during the school year and schooldays that start early are more prone to academic and emotional difficulties in the long run, compared to their earlier-to-bed counterparts.
"Going to bed after 11:30 pm, particularly in younger adolescents, predicted worse cumulative grade point average (GPA) at high school graduation and more emotional distress in the college years and beyond," said the study's lead author Lauren D Asarnow, a doctoral student in the department of psychology at the University of California, Berkeley.
In 2001-2002, as respondents aged, data on academic performance and self-reported emotional health were collected for longitudinal comparison.
The overall goal of the study was to examine the relationship between the sleep/circadian patterns of high school adolescents in a nationally representative sample, their overall academic performance in high school and rates of emotional distress reported post graduation.
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For both high school cohorts, 23 per cent of participants reported going to bed at 11:15 pm or later. By the time these teens reached graduation and college age, late school year bedtimes in high school predicted both lower cumulative GPA at graduation and more emotional distress between age 18 and 26.
Asarnow urged parents to help youngsters get to bed earlier and added that a teen's sleep behaviour is highly modifiable with proper support.
However, shifting a teen's bedtime from a late to an earlier hour can be hard, she added, in part because for 30 per cent to 40 per cent of teens, delayed bedtimes have a biological basis tied to the onset and progress of puberty.
The study was published in the Journal of Adolescent Health.