Answer :
Final answer:
Non-REM sleep typically lasts for about 90-120 minutes during a sleep cycle.
Explanation:
Non-REM sleep, also known as NREM sleep, is a stage of sleep that is characterized by low levels of brain activity and deep relaxation. It is divided into four stages: N1, N2, N3, and N4. NREM sleep typically lasts for about 90-120 minutes during a full sleep cycle.
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