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Learn about the 4 main sleep stages and circadian rhythms. By Carole Yue. More free lessons at: http://www.khanacademy.org/video?v=fNlp0UMqUtM

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/science/mcat) for MCAT related content.

These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.

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Date/TimeThumbnailDimensionsUserComment
current07:57, April 22, 2015Thumbnail for version as of 07:57, April 22, 201507:57480 × 269 (20 KB)Ash204 (wall | contribs)created video

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