Posted by: Pdfprep Category: USMLE Tags: USMLE certification, USMLE exam questions, USMLE practice exam Post Date: November 20, 2020 Pdfprep2020-11-20T12:45:27+00:00 The REM sleep cycle occur approximately every ____ minutes?A . 45B . 60C . 75D . 90 View Answer Answer: D Author Pdfprep
