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For a rigid body to remain in equilibrium it is necessary and sufficient that
REM Sleep
A stage of sleep characterized by rapid eye movements, more brain activity, and vivid dreams.
Brain Wave Pattern
Refers to the electrical activity in the brain, characterized by certain patterns detectible via EEG.
Awake and Alert
Being awake and alert refers to a state of consciousness where an individual is fully aware of their surroundings and able to react to stimuli.
REM Sleep
A stage of sleep characterized by rapid eye movements, dreaming, and brain activity similar to wakefulness, crucial for cognitive and emotional function.
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