During my site visiting years, I spent a considerable amount of time on planes reading accreditation applications. One thing that always puzzled me was that many centers included high and low ranges for sleep stages as a percentage of total sleep time. Despite the fact that my site visiting hit its peak in 2010, I think these numbers usually came from the 1974 opus by Williams, Karacan and Hirsch, which appears to be out of print. Patients with inadequate Stage 3 or excessive REM were branded as abnormal. But abnormal how?
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