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REM sleep: a biological and psychological paradox.
Siegel JM. Siegel JM. Sleep Med Rev. 2011 Jun;15(3):139-42. doi: 10.1016/j.smrv.2011.01.001. Epub 2011 Apr 8. Sleep Med Rev. 2011. PMID: 21482156 Free PMC article. Review. No abstract available.