↑Luca Matarazzo, Ariane Foret, Laura Mascetti, Vincenzo Muto, Anahita Shaffii, & Pierre Maquet, "A systems-level approach to human REM sleep"; in Mallick et al, eds. (2011).
↑Edward F. Pace-Schott, "REM sleep and dreaming", in Mallick et al, eds. (2011), p. 8. "A meta-analysis of 29 awakening studies by Nielsen (2000) revealed that about 82% of awakenings from REM result in recall of a dream whereas this frequency following NREM awakenings is lower at 42%."
↑Dmitri Markov, Marina Goldman, & Karl Doghramji (2012). "Normal Sleep and Circadian Rhythms: Neurobiological Mechanisms Underlying Sleep and Wakefulness". Sleep Medicine Clinics, 7(3), September 2012.