Joseph M. Dzierzewski, senior vice president of research and scientific affairs at the National Sleep Foundation, has uncovered something counterintuitive: the older you feel in your bones, the worse you sleep at night. A study of 3,177 adults presented at the SLEEP 2026 annual meeting reveals that feeling older than your chronological age predicts measurably worse sleep outcomes—including more insomnia symptoms, greater daytime impairment, and lower sleep regularity—even when researchers account for actual age, sex, race, depression, and anxiety.
The research matters because sleep is foundational to health in ways we're still learning to measure. The American Academy of Sleep Medicine identifies sleep as essential to wellbeing only when it meets four conditions: adequate duration, good quality, appropriate timing, and regularity—free from disturbances or disorders. When insomnia takes hold, daytime functioning deteriorates. But this study suggests something subtler: the psychological experience of aging itself, independent of how many years you've actually lived, can undermine the very rest that sustains you.
The study participants—mean age 42.8 years, 49% female—completed online surveys measuring their subjective age (how old they felt) against their chronological age, alongside assessments of insomnia severity, sleep health, sleep regularity, sleep-related impairment, and physical health. Researchers calculated "age discrepancy" as the difference between subjective and chronological age, divided by chronological age. Positive values meant feeling older; negative values meant feeling younger. Adults who felt older than their years reported consistently worse outcomes across every sleep measure examined. Mediation analyses found that this age discrepancy linked to poorer self-reported physical health indirectly—through its damaging effects on insomnia severity, sleep regularity, and daytime impairment.
What makes this finding significant is its resilience. The associations held firm even after controlling for depression and anxiety, conditions commonly entangled with both sleep problems and subjective aging. This suggests the effect isn't simply an artifact of mood disorders or psychological distress. The mismatch between how a person perceives their own aging and their actual years appears to be its own distinct risk factor for sleep trouble.
"These findings suggest how people perceive their own aging may have important implications for sleep and overall well-being," Dzierzewski observed, noting that the implications stretch beyond the clinic. Understanding subjective age could reshape public health messaging about aging itself—shifting it from passive acceptance of decline toward active promotion of healthier sleep and quality of life across the lifespan. In other words, how we talk about aging, and how individuals internalize those messages, may literally affect how well they sleep.
The pathway is indirect but consequential: feeling older than you are damages sleep regularity and increases insomnia and daytime dysfunction, which in turn erode self-reported physical health. That chain suggests an intervention point: interventions designed to shift subjective age perception, or to buffer against premature aging feelings, might unlock better sleep and cascading health gains. The science is still emerging, but the signal is clear—aging is not only a number on a birth certificate. It's a feeling that ripples through our nights and days.