Tidur gelombang perlahan, kerap dirujuk sebagai tidur nyenyak, terdiri daripada tahap 3 dan 4 tidur gerak mata tidak cepat, menurut piawaian Rechtschaffen & Kales (R & K) 1968.[2]
^Rechtschaffen, A (1968). A Manual of Standardized Terminology, Techniques and Scoring System For Sleep Stages of Human Subjects. US Dept of Health, Education, and Welfare; National Institutes of Health. Unknown parameter |coauthors= ignored (|author= suggested) (bantuan)
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