But caffeine is a drug (7) ______ can become addictive.

According to medical experts, one in five youngsters (5) ______ by on between two and five hours/ sleep a night, less than their parents did at their age.

Adults can easily survive on seven to eight hours' sleep a night, (4)_____ teenagers require nine or ten hours.

 …they are putting their mental and physical health at (3) ________.

According to a new report, today’s generation of children are in danger of getting so (2) _____  sleep….

Why is it that many teenagers have the energy to play computer games until late at night but can't find the energy to get out of bed  (1) _____ time for school?

Why is it that many teenagers have the energy to play computer games until late at night but can't find the energy to get out of bed  (1) _____ time for school?

You have to get enough sleep to (10) ______ stress and to stay healthy and full of energy.