So that's why they sleep all day
Sleep and teenagers: years | Raising Children Network
When actress Amanda Redman was recording the narration for a new BBC series on adolescence, she tried an experiment on her year-old daughter, Emily. The third part of Teen Species includes footage of a research project at Harvard in America in which teenagers are hooked up to a brain scanner and shown photographs of anguished faces; they are asked to describe the emotions portrayed. Redman stopped the tape on the photographs and asked her daughter to read the emotions. Emily's reaction was identical to that of the American teenagers in the laboratory experiment. Yet an adult looking at the photographs can see only terror. The "fear-face" experiment is one of several recent pieces of research that reveal unexpected information about the development of the brain during adolescence. As a result, aspects of teenage behaviour which have long baffled parents are becoming clearer.
As research shows adolescents are increasingly sleep-deprived - how to tell if your teen needs rest
Everyday Health Sleep Disorders Sleep. Getting teens to bed at a reasonable hour can help them behave and function better during the day. Here's how you can get your adolescent on a healthy sleep schedule.
Over a typical lifespan, the amount of time we spend each day sleeping declines. Newborns spend from 16 to 20 hours asleep each day. Between the ages of one and four, total daily sleep time decreases to about 11 or 12 hours. This gradual decline continues through childhood, such that an adolescent will need—though not necessarily get—about nine hours of sleep to function at his or her best. Adults through middle age need at least eight hours, and although the elderly may still require up to eight hours, they may struggle to obtain those hours in one block.