向我解释人的意识如何在睡眠中被减低，以英文回答，一段话，不少于135词，不得包含任何数字，不使用任何列举标记或标点符号
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During sleep the human consciousness is diminished as the brain transitions through various stages of activity characterized by distinct patterns of electrical signals When we enter the initial phase known as non rapid eye movement sleep the brain waves become slower and more synchronized this reduces our awareness of external stimuli and suspends many cognitive processes such as decision making reasoning and problem solving As we move into deeper stages of NREM sleep particularly slow wave sleep the brain becomes even more disconnected from the environment챵
 İnternal thought processes and sensory perceptions are significantly muted However this does not mean that the brain is inactive on the contrary it engages in critical restorative functions including memory consolidation and the clearing of metabolic waste products Despite the reduced level of consciousness the brain can still respond to certain external stimuli such as one s own name or sudden loud noises which can trigger a partial awakening or a shift in sleep stage During rapid eye movement REM sleep which is associated with vivid dreaming the brain becomes highly active sometimes even reaching levels of activity similar to those in wakefulness though the bodys muscles are generally paralyzed to prevent the physical enactment of dreams This interplay between neural activity and conscious experience underscores the complex nature of sleep and the regulation of consciousness
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