Correlation Between State-trait Anxiety and Sleep Structure in Patients with Insomnia / 中国心理卫生杂志

ABSTRACT

Objective:To explore the relationship between sleep structure changes and state or trait anxiety in patients with insomnia.Methods:Investigations were conducted with the State-trait Anxiety Inventory (STAI) and whole-night ploysomnography (PSG) recorded in 31 patients with insomnia and 20 normal controls.Repeated examinations were conducted in return visits 3～4 months after discharge.Results:Compared to control group,the patients with insomnia had decreased sleep time[(333.71±84.33) min vs.(403.65±19.29) min] and sleep efficiency[(70.41±17.35) % vs.(83.45±4.42) %],and increased sleep latency[(39.48±24.24) min vs.(19.65±8.57) min],REM sleep latency[(106.60±42.89) min vs.(86.80±12.25) min],proportion of S_1 sleep time[(25.36±14.22) % vs.(8.86±1.77) %]and awakening times[(4.45±2.51)vs.(1.75±1.07)].The proportions of S_(3+4) time[(7.38±9.70) % vs.(13.78±4.24) %] and REM sleep time reduced[(14.54±5.61) % vs.(19.18±2.14)%] (Ps<0.05).According to the STAI,scores of both state anxiety[(47.94±8.96) vs.(39.15±4.51)] and trait anxiety[(49.94±8.90) vs.(42.05±7.13)] were significantly higher in insomnia group than in control group (Ps<0.05).State anxiety was positively correlated with sleep latency (r=0.42),REM sleep latency (r=0.25),awakening times (r=0.44) and proportion of S_1 sleep time (r=0.34) (Ps<0.05),and negatively correlated with proportion of REM sleep time (r=-0.41,P<0.01).Trait anxiety was positively correlated with sleep latency (r=0.37,P<0.01) and wakefulness frequency (r=0.29,P<0.05).In return visits,the sleep structure improved,state anxiety score reduced,and trait anxiety had no significant changes.Conclusion:Patients with insomnia have significant sleep structural changes and higher state and trait anxiety.Their sleep structural changes are possilly related to state and trait anxiety.