This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Dreaming is common in which stage of sleep: September 2008 \nSelect and explain. \nA. REM, B. NREM 1, C. NREM 2, D. NREM 3', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: REM Humans aroused at a time when they show the EEG characteristics of REM sleep generally repo that they were dreaming, whereas individuals awakened from slow-wave sleep/ NREM do not. This observation and other evidence indicate that REM sleep and dreaming are closely associated. The tooth-grinding (bruxism) that occurs in some individuals is also associated with dreaming.', 'role': 'assistant'}]