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Which of these animals has a closed circulatory system?
Hypnagogic Sensations
Experiences at the onset of sleep, including visual, auditory, or tactile hallucinations that occur in the transition from wakefulness to sleep.
Narcolepsy
An ongoing sleep problem marked by significant day time drowsiness and abrupt sleep onslaughts.
REM Rebound
The phenomenon where there is an increase in the amount of REM (Rapid Eye Movement) sleep after a period of REM sleep deprivation.
Slow-Wave Sleep
The deepest phase of non-REM sleep, characterized by slow brain waves, reduced heart rate, and deep physical relaxation, which is restorative and vital for memory consolidation.
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