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THERE ARE TWO MAIN CATEGORIES OF SLEEP:
1. NON-RAPID EYE MOVEMENT (NREM)
1. Transitional Phase - Between wakefulness and sleep. This lasts for one to seven minutes and is 5% of the total sleep time.
2. Light Sleep Phase - This is 50% of the total sleep time.
3. Slow Wave Phase (Delta Phase) - A deeper and more relaxed sleep associated with 20% of the total sleep time. |
2. RAPID EYE MOVEMENT (REM)
| This is a period of deep, refreshing sleep. Eyes move side to side and the skeletal muscles are nearly paralyzed which results in a loss of muscle tone in the upper airway. This represents 25% of the total sleep time and is the stage where dreaming occurs. |
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