Circadian type and bed-timing regularity in 654 retired seniors: correlations with subjective sleep measures
| Autor: | Daniel J. Buysse, Janet E. Schlarb, Scott R. Beach, Mary E. Fletcher, Kathy S. Kennedy, Bart D. Billy, Timothy H. Monk |
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| Rok vydání: | 2011 |
| Předmět: |
Gerontology
Aged 80 and over Male Analysis of Variance Retirement Cross-sectional study Circadian Type and Bed Time in Retired Seniors Bedtime Circadian Rhythm Pittsburgh Sleep Quality Index Shift work Interviews as Topic Cross-Sectional Studies Telephone interview Physiology (medical) Surveys and Questionnaires Humans Female Neurology (clinical) Analysis of variance Sleep (system call) Circadian rhythm Psychology Sleep Aged |
| Zdroj: | Sleep. 34(2) |
| ISSN: | 1550-9109 |
| Popis: | STUDY OBJECTIVES Using telephone interview data from retired seniors to explore how inter-individual differences in circadian type (morningness) and bed-timing regularity might be related to subjective sleep quality and quantity. DESIGN MANCOVA with binary measures of morningness, stability of bedtimes, and stability of rise-times as independent variables; sleep measures as dependent variables; age, former shift work, and gender as covariates. SETTING Telephone interviews using a pseudo-random age-targeted sampling process. PARTICIPANTS 654 retired seniors (65 y+, 363M, 291F). INTERVENTION none. MEASUREMENTS AND RESULTS INDEPENDENT VARIABLES (1) circadian type (from Composite Scale of Morningness [CSM]), and stability of (2) bedtime and (3) rise-time from the Sleep Timing Questionnaire (STQ). DEPENDENT VARIABLES Pittsburgh Sleep Quality Index (PSQI) score, time in bed, time spent asleep, and sleep efficiency, from Sleep Timing Questionnaire (STQ). Morning-type orientation, stability in bedtimes, and stability in rise-times were all associated with better sleep quality (P < 0.001, for all; effect sizes: 0.43, 0.33, and 0.27). Morningness was associated with shorter time in bed (P < 0.0001, effect size 0.45) and time spent asleep (P < 0.005, effect size 0.26). For bedtime and rise-time stability the direction of effect was similar but mostly weaker. CONCLUSIONS In retired seniors, a morning-type orientation and regularity in bedtimes and rise-times appear to be correlated with improved subjective sleep quality and with less time spent in bed. |
| Databáze: | OpenAIRE |
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