Posted by
indah73
142 days ago
(http://sleepdeprivationandreactiontime.wordpress.com)
Category: public blog science health
Stage 1: A transitional stage between waking and sleep. Your brain waves and muscle activity slow. Sometimes people’s bodies jerk just before they fall asleep.
Stage 2: In this light sleep stage, eye movements cease. Body temperature drops, and heart and brain activity slows. NSF material says there are periods of muscle tone and muscle relaxation, and that occasional brain-wave spikes, called sleep spindles, occur during this stage of sleep.
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