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Gerontology involves the physiological aspects of aging and the unique health concerns of older people.
NREM Sleep
Non-Rapid Eye Movement sleep, which is characterized by slower brain waves and is considered restorative sleep.
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.
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