(HealthDay News) -- Teenagers need to get plenty of sleep -- between 8 1/2 and nine hours every night -- to feel good and keep their bodies healthy.
Pay attention to these warning signs, courtesy of the U.S. Department of Health and Human Services, that you may not be getting enough shuteye:
- Difficulty getting out of bed in the morning.
- Problems focusing.
- Falling asleep at school during class.
- Feeling depressed, irritable, moody or sad.