What do systematic reviews say?

Quantity and quality of sleep as measured through reports of participants or of family members or by personnel assessments Data collected at end of · adult patients in the ICU

Quantity and quality of sleep as measured by PSG, actigraphy, BIS, or EEG Data collected at end of · adult patients in the ICU

Anxiety or depression, or both Data collected at end of · adult patients in the ICU

Mortality Study authors did not report final timepoint for data collection. · adult patients in the ICU

Length of stay in the ICU · adult patients in the ICU

Adverse events (such as nausea, dizziness and headache) Data collected at end of · adult patients in the ICU