Fig. 3

A typical case of shallow sedation group was 4-year-old boy diagnosed acute severe bronchopneumonia for 5 days, type II respiratory failure, mechanical ventilation 66 h, ramsay score 3 points, his sleep was primarily in the NREM-2 and NREM-3 stage; The typical case in the deep sedation group was 4-year-old boy, diagnosed with acute severe bronchial pneumonia for 3 days, type II respiratory failure, mechanical ventilation 74 h, ramsay score 5 points, his sleep was primarily in the NREM-3 stage. There was loss of the NREM-1 and REM stages. In Phase 1, patients in both groups experienced transient EEG changes after nursing stimulation and then entered the NREM sleep stage. In Phase 2, patients in the light sedation group basically returned to normal sleep cycles, while patients in the deep sedation group still had decreased REM sleep