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Why Do Some Sleep Disconnects Occur
A scientific study from the University of Lausanne and the University of Geneva in Switzerland has shown that the brain focuses less on external sounds and pays greater attention to internal bodily signals, especially the heartbeat, during the REM sleep phase. The results indicate that when entering deep sleep, the brain's responsiveness to external sounds diminishes, while its response to internal signals is heightened. This explains why people do not hear external noises while dreaming. This study could help in understanding the level of consciousness in patients who are unable to respond, such as those under anesthesia or experiencing consciousness disorders.
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