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Explain the difference between physical capital and human capital.
REM Sleep
REM sleep, or Rapid Eye Movement sleep, is a stage of sleep characterized by fast eye movements, vivid dreams, and increased brain activity.
Sleep Cycle
The progression through various stages of non-REM and REM sleep that occurs throughout a typical night, playing crucial roles in rest and recovery.
Stage 4
In the context of sleep, this refers to the deepest stage of NREM (non-rapid eye movement) sleep, characterized by the presence of delta waves and considered crucial for restorative sleep.
REM
Rapid Eye Movement, a sleep phase characterized by fast and random movements of the eyes, associated with vivid dreaming and increased brain activity.
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