How is Rapid Eye Movement (REM) Sleep Related to Deep Slow-Wave Sleep (SWS) in Humans?




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Sleep consists of two broad phases: rapid eye movement (REM), and non-REM sleep, and the deepest stage of non-REM sleep is slow-wave sleep (SWS). SWS and REM sleep are believed to be related, but exactly how is not known. As SWS has been studied and believed to be essential to brain restoration, REM sleep could hold an important function that needs to be explored. This research analyzed the electroencephalogram data of over 5,000 subjects to find the relationship between various parameters within REM sleep and other stages of sleep. The data was recorded by Sleep Heart Health Study and analyzed by MATLAB. The main parameters which were studied are power spectra, sleep time, percentage of total sleep time, REM density, and nasal air temperature. Using Borbely study as the reference, parameters were paired and taken Spearman correlation coefficients for all subjects on first visit, only healthy subjects on first visit, and all subjects that continued follow-up visit (1). Instead of getting a contrasting relationship between SWS and REM sleep as suggested in previous studies, the result shows a complementary relationship for SWS and REM sleep.