is growth hormone secreted in rem or nrem sleep?

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The timing of the greatest release of human growth hormone (HGH) is in the first deep sleep cycle.

In a research: The sleep in young adults with severe isolated growth hormone deficiency (IGHD) was examined by polysomnography. There was a significant decrease in delta sleep time (= stages 3 + 4, slow wave sleep, 'deep sleep'), especially in stage 4.

answered May 4, 2013 by Mike Junior Resident (2,007 points)