More Than Calories and Cardio: How a Good Night’s Rest Predicts a Longer Life

In the gentle rhythm of everyday life — the closing of eyes at night, the quiet moments between work and dawn — there lies a simple act that may matter more to how long we live than the foods we choose or the steps we take on the treadmill. A new study has found that how long you sleep each night may be a stronger predictor of longevity than diet or exercise, placing sleep at the forefront of discussions about healthy aging.

Researchers from Oregon Health & Science University (OHSU) analyzed survey data spanning 2019 to 2025 across the United States, comparing self-reported sleep duration with measures of life expectancy. They found that individuals who consistently got fewer than seven hours of sleep per night had a significantly higher association with lower life expectancy — even after accounting for diet quality, physical activity, work status, and education level.

This association remained strong even when other behaviors known to influence longevity were factored in. In the models used, insufficient sleep showed a stronger link with reduced life expectancy than many other lifestyle factors, including diet and exercise patterns — second only to smoking in terms of strength of association.

Experts emphasize that while this study cannot prove that lack of sleep causes shorter life, its findings add to a growing body of research suggesting that sleep is a vital pillar of long-term health, on par with physical activity and nutrition. Getting adequate sleep — generally defined as seven to nine hours per night by sleep medicine societies — supports immune function, cognitive processes, metabolic regulation, and cardiovascular health, all of which play critical roles in aging.

Lead sleep physiologist Andrew McHill noted that the results were striking given how deeply integrated sleep is with daily life, yet how often it is overlooked in public health guidance compared with diet and exercise. He suggested that prioritizing sleep may bring meaningful benefits — improving not only how people feel on a given day, but how long they might live.

As people consider their daily habits, this research invites a fresh perspective: sometimes the most impactful choices are not about intensity or discipline but about consistency and rest. In a world that often glorifies busyness, the quiet act of sleeping enough may be one of the most powerful investments we make in our long-term health.

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Sources ScienceAlert reporting on the sleep and longevity study OHSU research findings referenced in news coverage