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Lecture 9. Sleep Mechanisms

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Icahn School of Medicine

Objectives

To gain an understanding of:
• What is sleep?
• Stages of sleep
• NREM (nonREM) and REM (rapid eye movements) sleep
• The concept of RAS (reticular activating system)
• Identified systems within RAS
• Homeostatic drive and circadian rhythms
• What makes you “fall” asleep?

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