Many teenagers today are sleep deprived because they don’t get enough sleep. They need between nine and 10 hours sleep each night, yet most get about seven or eight hours sleep. Some get less. Sleep deprivation is akin to jet lag, where they don’t function at their optimum. The sleep-wake cycle for teenagers is delayed by up to two hours. That is, they are sleepy later and awake later than when they were children.
Most teens secrete melatonin, which makes them sleepy, around 11.00pm, which makes the time before then a sleepless zone. Children secrete melatonin far earlier than this.
Cortisol, the chemical that wakes them up, is secreted at 8.15am for many teens. It seems the teen brain wants to be asleep just when most have woken up.
One US study found that 20% of teens were asleep in class in the morning, which had catastrophic effects...(sign-up as a member to continue reading this article)