Analysis of characteristics of polysomnography in patients with multiple dreams

Objective To investigate the characteristics of sleep structures in patients with multiple dreams through the retrospective analysis of polysomnography in patients with multiple dreams, and to provide a theoretical basis for the treatment of multiple dreams. Methods Twenty-two cases with multiple dreams in Department of Neurology, the People′s Hospital of Zhengzhou University from July 2015 to Ferbuary 2018 were included in multi-dream group and 12 healthy people in control group. The sleep parameters related to polysomnography during the visit were collected and recorded, and the differences between the two groups were compared. Resluts There was no statistically significant difference in apnea-hypopnea index, sleep latency, rapid eye movement (REM) sleep latency, slow-wave sleep ratio, and REM-arousal index between the two groups. Compared with the control group, sleep efficiency (73.46%±12.41% vs 90.43%±4.42%, t=-4.555, P=0.000), REM period ratio (16.28%±5.59% vs 21.59%±2.70%, t=-3.727, P=0.001) decreased in the multi-dream group; whereas ratio of light sleep (66.49%±9.97% vs 59.85%±3.01%, t=2.966, P=0.006), awakening numbers (13.4±6.98 vs 6.08±3.34, t=3.411, P=0.002), arousal index (20.11±10.69 vs 11.82±8.09, t=2.338, P=0.026), non-REM arousal index (20.22±10.53 vs 12.08±8.69, t=2.283, P=0.029) increased. Conclusion The sleep efficiency of patients with multiple dreams is reduced, and their perceived dreams may originate from light sleep periods. Key words: Dreams; Sleep disorders; Sleep, REM; Polysomnography