Sleep science has long focused on the number of hours, and how that impacts health and lifespan. But a 2023 study from Harvard and Monash University researchers found that going to bed and waking up at consistent times with few mid-slumber interruptions matters even more than how long you sleep. Sleeping six hours every night on a consistent schedule was associated with a lower risk of early death than sleeping eight hours with irregular habits (interrupted sleep and napping, etc.). Sleep regularity reduced the risk of premature death by 20% to 48% compared with those with the most irregular sleep.
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