1) False (Правильно: Teenagers everywhere are trying to get just a little more sleep).
2) False (Правильно: Teenagers need to sleep an hour longer than adults, they also usually feel sleepy later at nights that adults and take longer to wake up in the morning)
3) True
4) False (Правильное: If you don't dleep enough you eat more unhealthy food to help you stay awake)
5) True
6) True