| Term | Definition |
| fatigue | weariness from physical or mental exertion |
| what is the 2nd most common health complaint? | fatigue |
| resting | relief or freedom, especially from anything that weariness, troubles or disturbs; refreshing ease or inactivity after exertion or labor |
| emotional fatigue | being emotionally tired- overwhelmed and over worked feelings |
| what is emotional fatigue caused by? | tension, stress, frustration, fear, and boredom |
| fatigue due to illness | occurs when your body is fighting a sickness |
| amount of sleep adults need | 5-9 hours |
| amount of sleep teens need | 10 hours |
| 4 stages of sleep | gradually fall into deeper sleep, your whole body slows down, nightmares and sleep-walking occur in stage 4, REM |
| REM (rapid eye movement) | eyes dart back and forth, dreaming occurs, breathing and heartbeat are irregular, body is almost paralyzed state |
| how many times you go through sleep cycle | 4 or 5 times |