PMC6739709_01
Summary of the sleep study at first polysomnographic investigation. The hypnogram shows a dramatic reduction in total sleep time and complete loss of deep non-REM and REM sleep stages.
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F1
Sleep efficiency was calculated as 4.5% (Fig. 1).
The hypnogram obtained at the second polysomnographic investigation reveals major recovery in sleep organization, with an increased total sleep time and re-acquisition of sleep stages.
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PMC6739709_01_crn-0011-0080-g02.jpg
F2
Sleep efficiency had increased from 4.5 to 49.9% (Fig. 2).