India, June 17 -- A large scientific review suggests that sleeping too little or too much may not significantly raise overall cancer risk, challenging long-held assumptions about the role of sleep in cancer development.
Research analyzed data from more than 1.5 million people across 65 studies to understand whether sleep duration influences cancer risk. The findings, published in BMC Cancer, show no strong evidence that short or long sleep duration increases the likelihood of developing cancer.
What the Study Found
The review looked at both short sleep (typically less than 6 hours per night) and long sleep (more than 9 hours per night). Across the full population:
-Short sleep was not linked to higher overall cancer risk.
-Long sleep a...