What are the key differences between REM and NREM sleep? Explain with reference to the key theories why sleep is a vital process for humans. Posted on December 17, 2022 by Assessments Words: 25Pages: 1Subject: PsychologyTopics: Assignment help, College essays, Essayhelp, humans, key theories, REM and NREM sleepWhat are the key differences between REM and NREM sleep? Explain with reference to the key theories why sleep is a vital process for humans.