Melatonin Secretion Pattern in Critically Ill Patients: A Pilot Descriptive Study

Figure 4

Distribution of sleep modes by gender and remifentanil infusion. All the PSG epochs are classified into 4 groups: normal sleep (AASM standard), atypical sleep (Watson’s classification), awake (wake), and undefined (the epochs with artefacts). The distribution of these groups by gender and remifentanil infusion at different ages is shown on the graph. The grey field represents confidence intervals.