Intra-individual variability in sleep duration and fragmentation: Associations with stress

PSYCHONEUROENDOCRINOLOGY

卷:34

Article

Mezick, Elizabeth J.²  Matthews, Karen A.¹  Kamarck, Thomas W.²  Reis, Steven E.³ 

[1] Univ Pittsburgh, Sch Med, Dept Psychiat, Pittsburgh, PA 15213 USA

[2] Univ Pittsburgh, Dept Psychol, Pittsburgh, PA 15213 USA

[3] Univ Pittsburgh, Cardiovasc Inst, Pittsburgh, PA 15213 USA

关键词: Intra-individual variability;    Sleep;    Actigraphy;    Stress;    Norepinephrine;    Negative affect;   

DOI  :  10.1016/j.psyneuen.2009.04.005

来源: Elsevier

【 摘 要 】

Despite growing evidence that there is substantial nightly, intra-individual variability in sleep duration and fragmentation, few studies have investigated the correlates of such variability. The current study examined whether intra-individual variability in sleep parameters was associated with psychosocial. and physiological indices of stress, especially among those high in negative affect. Participants were 184 adults aged 46-78 (53% men and 41% Black) in the Pittsburgh SleepSCORE study. Wrist actigraphy was used to estimate sleep duration and fragmentation for nine nights, and overnight samples of urinary norepinephrine were collected for two nights. Stressful life events, depression, and anxiety were also reported. Intra-individual differences exceeded between-person differences in actigraphy-measured sleep duration and fragmentation. Stressful life events were associated with increased nightly variability in duration and fragmentation (ps < .05). Negative affect moderated associations between norepinephrine and variability in sleep, such that the greatest variability in actigraphy measures was among those with both high norepinephrine levels and high negative affect (ps < .05). These data suggest that both psychosocial and physiological stress are related to increased nightly variability in individuals' steep duration and fragmentation, particularly among those reporting negative emotions. These results may have implications for both steep and health research. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

Free