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<a accesskey="3" href="page.php?w=Sleep&amp;p=2">3.Next</a>
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<p><b>Sleep</b> is a state of reduced mental and physical activity in which <a href="page.php?w=consciousness">consciousness</a> is <a href="page.php?w=Altered_state_of_consciousness">altered</a> and certain <a href="page.php?w=Sensory_nervous_system">sensory</a> activity is inhibited. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment. While sleep differs from <a href="page.php?w=wakefulness">wakefulness</a> in terms of the ability to react to <a href="page.php?w=Stimulus_%28physiology%29">stimuli</a>,</p><p>
<a accesskey="3" href="page.php?w=Sleep&amp;p=2">3.Next</a>
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