What Having a Steady Partner Is Linked to in Midlife Women's Sleep
In 367 women followed through midlife, those with a consistent partner over six to eight years had better objectively measured sleep continuity than women who were unpartnered, gained a partner, or lost one, even after accounting for other health and demographic factors.
Sleep, Women's Health, Midlife
This study followed 367 midlife women, using both in-home polysomnography and weeks of actigraphy to objectively measure their sleep, and linked it to their relationship history over the preceding six to eight years. Women who had been consistently partnered, married or cohabiting, throughout that period had measurably better sleep continuity than women who had remained unpartnered, or whose relationship status had changed, gaining or losing a partner along the way. The advantage held even after adjusting for age, health and other factors that might otherwise explain the difference, suggesting the stability of the relationship itself, not just partnership status at a single point in time, is what mattered.
As an observational study, it can't fully separate cause from effect, women in stable relationships may differ from others in ways the researchers couldn't measure. It's also specific to midlife women rather than younger adults or men. Read alongside the more mixed findings on nightly co-sleeping itself, this study points to something slightly different: it may be relationship stability over years, rather than sharing a bed on any given night, that carries the clearest sleep benefit for women at this stage of life.
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