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What are the different categories of sleep?

Sleep breaks down into 2 categories: Non-REM sleep (Stages 1, 2, 3, & 4) and REM sleep. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.