Journal of sleep research
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Journal of sleep research · Oct 2012
Internight sleep variability: its clinical significance and responsiveness to treatment in primary and comorbid insomnia.
Although sleep diary and actigraphy data are usually collected daily for 1 or 2 weeks, traditional analytical approaches aggregate these data into mean values. Internight variability of sleep often accompanies insomnia. However, few studies have explored the relevance of this 'construct' in the context of diagnosis, clinical impact, treatment effects and/or whether having 'variable sleep' carries any prognostic significance. ⋯ Higher SOL variability was associated with worse treatment outcomes within the PI group, whereas higher WASO variability was correlated with better treatment outcomes within the CMI group. Sleep variability differences across insomnia diagnoses, along with their distinctive correlates, suggest that mechanisms underlying the sleep disruption/complaint and treatment response in both patient groups are distinct. Further studies are warranted to support variability as a useful metric in insomnia studies.
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Journal of sleep research · Oct 2012
Perceived poor sleep quality in the absence of polysomnographic sleep disturbance in women with severe premenstrual syndrome.
Women with severe premenstrual syndrome report sleep-related complaints in the late-luteal phase, but few studies have characterized sleep disturbances prospectively. This study evaluated sleep quality subjectively and objectively using polysomnographic and quantitative electroencephalographic measures in women with severe premenstrual syndrome. Eighteen women with severe premenstrual syndrome (30.5 ± 7.6 years) and 18 women with minimal symptoms (controls, 29.2 ± 7.3 years) had polysomnographic recordings on one night in each of the follicular and late-luteal phases of the menstrual cycle. ⋯ In women with premenstrual syndrome, a poorer subjective sleep quality correlated with higher anxiety (r = -0.64, P = 0.005) and more perceived nighttime awakenings (r = -0.50, P = 0.03). Our findings show that women with premenstrual syndrome perceive their sleep quality to be poorer in the absence of polysomnographically defined poor sleep. Anxiety has a strong impact on sleep quality ratings, suggesting that better control of mood symptoms in women with severe premenstrual syndrome may lead to better subjective sleep quality.