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ICU sleep patterns 'highly abnormal'

Quality of sleep in intensive care units (ICU) is fragmented, with patients unable to reach deep stages of sleep necessary for physical and mental restoration, according to research.A study of 16 ICU patients monitored with polysomnography instruments found a decrease in the proportion of deep sleep and an increase in superficial sleep.They spent just 1% of sleep time in REM stages three and four, compared with healthy controls who spent 20% of sleep ...

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