Teenagers and sleeping ( ex. 7, p. 49-50)

Teenagers often have bad mood in the morning because they don't get enough sleep.

Watching TV late at night helps teenagers to fall asleep.

Playing computer games makes it harder for teenagers to fall asleep.

Teenagers can't get out of bed in time because of their laziness.

Teenagers can't go to bed at 10 p.m. because their bodies start to produce melatonin at 1 a.m.

In America some schools have decided to start their classes at 10 a.m.

Sleep is extremely important only for children and adults.

Sleep is extremely important only for children and adults.

While sleeping teenagers release a hormone which is essential for their growth.

The "darkness hormone" is produced at night.

American students do much better in class when they have some extra time in bed in the morning.

Playing computer games late at night stimulates producing melatonin that helps teenagers to fall asleep.