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Non-rapid eye movement (REM) sleep
Sleep stage with regular breathing and muscle tone
Delta wave
Brain activity pattern in deep sleep stage 3
Stage 2
Non-REM sleep with decreased heart rate and muscle relaxation
Body's short-term hibernation period
Characteristic of deep sleep in stage 3
Muscle mobility
Movement capability during REM sleep
What is Stage 3 of sleep characterized by?
Non-REM sleep with delta wave brain activity and immune system strengthening, and the repair and regeneration of muscles, tissues, and bones.
What is another name for Stage 3 of sleep?
Stage 3 (NREM) is also known as the deepest sleep stage.
What are the characteristics of Stage 4 sleep?
REM sleep with increased heart rate, decreased temperature, and heightened brain activity
What is Stage 4 also known as?
The dreaming stage
