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: . Deric's MindBlog This blog reports new ideas and work on mind , brain , behavior , psychology , and politics as well as random curious stuff Monday , January 30, 2023 How sleep shapes what we remember and forget . I have found monitoring the quality of my sleep to be a fascinating and useful activity . I use both the Oura ring and Apple watch to monitor body temperature , body movement , heart rate , and heart rate variability , and then compare their different but broadly similar algorithmic estimates of deep sleep , REM sleep , non-REM sleep , and wake periods . I'm on the lookout for articles on sleep during my scans of journals' tables of contents , and have come upon this review by Sakai of what is happening in our sleep to be concise and useful . Below is a more general overview