Is too much sleep dangerous? Reuters Health reports.
Compared to women sleeping eight hours a night, women who slept at least nine hours were 46 percent more likely to die of breast cancer, the study found. After up to 30 years of follow-up, the women who got more sleep were also 34 percent more likely to die of other causes.
“Sleep duration, but also changes in sleep duration before versus after diagnosis, as well as regular difficulties to fall or to stay asleep, may also be associated with mortality among women with breast cancer,” said lead study author Claudia Trudel-Fitzgerald of the Harvard T.H. Chan School of Public Health in Boston.
“Given that long sleep duration has been associated with mortality among cancer-free individuals, as well as among breast cancer patients in recent studies including ours, it is possible that the relationship of sleep duration with survival also exists for other types of cancer,” Trudel-Fitzgerald said by email. “However, further research is warranted.”
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