0355 Complaining Versus Noncomplaining Good Sleepers: Impact of Night-to-Night Variability in Sleep Parameters on Subjective Sleep Appraisal

Abstract Introduction Insomnia identity refers to the conviction that one has insomnia, which can occur despite the presence of quantitatively-defined good sleep. Night-to-night variability in sleep may contribute to insomnia identity yet remain undetected via conventional analyses of mean sleep parameters. This study aimed to compare combined mean differences between complaining good sleepers (CG) and noncomplaining good sleepers (NG) on three dependent measures of sleep IIV: intraindividual standard deviation (iSD) in sleep efficiency (iSD SE), wake after sleep onset (iSD WASO), and sleep onset latency (iSD SOL). Methods This study analyzed 14 days of sleep diary data from community-dwelling adults ages 20 to 98. One-to-one propensity score matching was conducted to match a group of 70 CG on gender, race, and age to NG. An independent group multivariate Hotelling’s T2 test was performed to compare combined mean differences between the independent groups of NG and CG on three dependent measures of sleep night-to-night variability: iSD SE, iSD WASO, and iSD SOL. Results Hotelling’s T2 revealed a statistically significant combined mean difference between the two groups for the three dependent variables of iSD SE, iSD WASO, and iSD SOL (T2 = 3.3, df = 3, 136, p = .021). The mean iSDs for CG were higher than the mean iSDs for NG on the three dependent variables. The multivariate results indicated a significant dependent variable joint effect. The multivariate effect size (as measured via the partial eta squared) was .068, a medium effect. Conclusion Among good sleepers, there existed notably greater night-to-night variability in sleep among individuals with a sleep complaint compared to those without a complaint. This finding suggests consistency in sleep patterning may be a particularly important intervention target among patients presenting with sleep complaints in the absence of mean-level poor sleep. Support (If Any) Research supported by NIA grants AG12136 and AG14738.