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Normal waking hours - PowerPoint PPT Presentation

Stages of Sleep and Sleep Disorders

Stages of Sleep and Sleep Disorders. What is the nature of sleep?. Most people think of sleep as a state of unconsciousness , punctuated by brief periods of dreaming. . Sleep is actually a state of altered consciousness , characterized by certain patterns of brain activity and inactivity .

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Normal waking hours - PowerPoint PPT Presentation

Stages of Sleep and Sleep Disorders