REM sleep usually first occurs about 90 minutes after you fall asleep; cycles along with the non-REM stages throughout the night.
- Eyes move rapidly, with eyelids closed.
- Breathing is more rapid, irregular, and shallow.
- Heart rate and blood pressure increase.
- Dreaming occurs.
- Arm and leg muscles are temporarily paralyzed.
Stage 1: Light sleep; easily awakened; muscle activity; eye movements slow down.
Stage 2: Eye movements stop; slower brain waves, with occasional bursts of rapid brain waves.
Stage 3: Considered deep sleep; difficult to awaken; brain waves slow down more, but still have occasional rapid waves.
Stage 4: Considered deep sleep; difficult to awaken; extremely slow brain waves.
Quality performance requires quality sleep. Quality sleep is a combination of quantity and proper combination of NREM/REM sleep. Most people need a minimum of 5 hours of sleep with 2-3 REM periods.
We need consolidated, restorative sleep:
- Functioning is a safe efficient and effective way
- Cognitive, social and physical performance
- Learning and memory consolidation
- Emotional enhancement
- Prevention of health problems