Insufficient Sleep Strongly Predicts Shorter Life Expectancy
- Sleeping fewer than seven hours per night is strongly linked to a shorter lifespan, even when factors like diet, exercise, income, and access to health care are taken into account
- Large-scale U.S. data shows sleep loss predicts reduced life expectancy more reliably than many habits people focus on daily, including physical inactivity and obesity
- Chronic short sleep keeps your heart, immune system, and brain under constant strain, preventing the nightly repair work your body relies on to stay resilient over time
- Sleep pressure builds when your cells fail to produce energy efficiently, leading to toxic byproducts that force your brain into deeper fatigue and stronger sleep demand
- Improving sleep is one of the most practical and controllable ways to support long-term health, because nightly sleep habits respond directly to changes in light exposure, environment, and daily timing
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