The Complexity of Dreams: a Multiscale Entropy Study on Cardiovascular Variability Series.
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference July 1, 2019 M Nardelli, U Faraguna, G Grandi et al.
Dream recall is linked to higher complexity in cardiovascular control during REM sleep. Researchers recorded electrocardiogram and arterial blood pressure from eight healthy subjects during REM sleep before awakening. Recordings were split into those with and without dream recall. Sample Entropy showed no statistical difference between groups, but multiscale complexity analysis using Distribution Entropy and Fuzzy Entropy revealed that higher cardiovascular complexity is associated with a dreaming experience.