Saturday, October 15, 2005

Sleep duration and breast cancer: a prospective cohort study

P K Verkasalo, K Lillberg, et al. Cancer Research. 2005 Oct 15;65(20):9595-600.
"Breast cancer incidence has increased during recent decades for reasons that are only partly understood. Prevalence of sleeping difficulties and sleepiness has increased, whereas sleeping duration per night has decreased. We hypothesized that there is an inverse association between sleep duration and breast cancer risk, possibly due to greater overall melatonin production in longer sleepers....This study provides some support for a decreased risk of breast cancer in long sleepers."


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