Sleep duration and quality linked to mortality and health risks

Recent scientific evidence highlights the critical link between sleep duration, quality, and longevity. According to data from the National Center for Health Statistics, 30.5% of adults sleep fewer than seven hours per night, and only 54.8% report waking up feeling rested.

A meta-analysis published in GeroScience indicates that sleep duration has a non-linear relationship with mortality. Sleeping fewer than seven hours per night is associated with a 14% increase in the risk of death from any cause compared to those sleeping seven to eight hours. Conversely, sleeping nine hours or more increases that risk to 34%.

Experts emphasize that sleep quantity does not always equate to sleep quality. Even if an individual spends eight hours in bed, factors such as frequent interruptions, shallow sleep, or improper timing can prevent restorative rest. The National Heart, Lung, and Blood Institute notes that fragmented sleep—often caused by noise, temperature, light, or breathing difficulties—can leave individuals feeling fatigued and unable to concentrate despite sufficient time spent sleeping.