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Talk Therapy for Insomnia May Slow the Body’s Aging Clock
In A Nutshell
- A UCLA trial found that older adults treated with structured talk therapy for insomnia showed a slower pace of biological aging on one epigenetic marker than a comparison group.
- The comparison group, who received general sleep education instead, showed a measurable speedup in that same marker over roughly two years.
- People treated with the insomnia therapy were also more likely to have their insomnia fully go into remission, 34 percent compared with 13 percent.
- Researchers call the findings preliminary and say larger studies are needed to confirm whether treating insomnia can reliably slow biological aging.
Losing sleep night after night does more than leave a person groggy. Previous research has linked chronic insomnia in older adults to faster biological aging, and a new analysis of a randomized clinical trial suggests that treating insomnia with structured talk therapy may help keep that pace from speeding up further.
Researchers at UCLA followed a group of adults over 60 who struggled with insomnia, comparing those who received structured talk therapy for sleep problems against those who got a general sleep education class. Blood samples taken before treatment and again roughly two years later let scientists estimate each person’s biological age, a measure of wear and tear on the body that doesn’t always match the number on a birth certificate. Published in The Lancet Healthy Longevity, the analysis found that the group who received the more intensive therapy showed a slower pace of biological aging on one specific measure than the comparison group.
This trial stands apart from the usual sleep-and-health story. It appears to be the first study to test whether treating insomnia changes epigenetic markers of biological aging within a randomized clinical trial. That distinction matters, because insomnia in later life has already been linked to frailty, heart disease, certain cancers, and earlier death in past research. If a structured therapy program can measurably slow one marker of biological aging, it opens a new path toward keeping older adults healthier for longer, though larger studies are still needed to confirm it.
A DNA Test Can Show How Fast the Body Truly Ages
Chronological age is just a calendar count. Biological age is different. It reflects how much damage and decline has built up inside cells and tissues, and it can run faster or slower than the calendar suggests depending on a person’s health, stress levels, and lifestyle. Scientists estimate biological age by looking at chemical tags on DNA that shift in predictable patterns over time. Tools that read these patterns are called epigenetic clocks, and researchers used three versions, one built specifically to capture the pace of aging rather than a snapshot estimate.
Data came from a larger trial run at UCLA between 2012 and 2015 that recruited adults over 60 in the Los Angeles area who met formal criteria for insomnia disorder. Participants were split at random into two groups. One received cognitive behavioral therapy for insomnia, known as CBT-I, delivered in group sessions over eight weeks and built around adjusting sleep habits, retraining thought patterns around sleep, and relaxation exercises. Another attended sleep education sessions covering sleep hygiene and the biology of sleep and stress, without the same behavior-change tools.
Blood was drawn before treatment began and again at a follow-up visit that happened between about a year and a half and just over three years later. Researchers had usable, paired blood samples from 92 people for this analysis. Forty-seven had received CBT-I, with an average age of about 69 and a half. Forty-five had received sleep education, with a nearly identical average age. Most other background traits, like education level and body weight, were similar between groups, though the sleep education group included more women.
Therapy Group’s Aging Pace Held Steady While the Other Group Sped Up
Researchers zeroed in on DunedinPACE, the clock built specifically to measure the pace of aging rather than a fixed age estimate. It was the only one of the three to show a statistically reliable gap favoring the therapy group, one that held up even after adjusting for age, sex, weight, and education.
Looking within each group separately adds detail. People who received sleep education, on average, saw a measurable speedup in their pace of aging over the study period. People who received CBT-I showed no real shift one way or the other on this measure, meaning the therapy appeared to hold the line against the acceleration seen in the comparison group.
A second clock, GrimAge, offered a more mixed result. People in the therapy group showed a real decline on this measure over time, but that drop wasn’t clearly different from what happened in the sleep education group once researchers accounted for the odds of a false alarm across multiple tests. A third clock, PCPhenoAge, showed no clear difference between groups at all.
Remission from insomnia tracked with these patterns too. People who received CBT-I were more likely to remain free of insomnia across every follow-up assessment, 34 percent compared with 13 percent in the sleep education group. In an exploratory analysis, participants in the sleep education group whose insomnia never improved showed the sharpest speedup in aging pace, while those in either group whose insomnia went into remission tended to show a more favorable trajectory. That pattern hints, though it does not prove, that resolving sleep problems may matter as much as which treatment someone received.
Stress and Inflammation May Link Sleep Loss to Aging
Insomnia already carries a reputation as a quality-of-life problem. There may be a biological dimension too, especially for older adults whose bodies have less reserve to bounce back from stress. Researchers involved in the work pointed to possible mechanisms tied to the body’s stress response system, including inflammation and metabolic strain that build up when sleep problems go untreated for years.
None of this means a few months of therapy can undo decades of wear and tear, and the researchers themselves call these findings preliminary, in need of confirmation with larger studies. Still, the takeaway holds up: insomnia in older age looks less like a nuisance to tolerate and more like a risk factor worth treating, right alongside diet and exercise.
Disclaimer: This article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare provider before making decisions about insomnia treatment or other health conditions.
Paper Notes
Limitations
Researchers noted several caveats when interpreting these results. Because of cost constraints, only a subset of participants from the original larger trial had usable blood samples for this analysis, which may have introduced selection bias and reduced the statistical power of the comparisons. The sample consisted largely of healthy older adults, so findings might not apply to people with chronic inflammatory conditions. The study took place at a single university medical center in Southern California, and the population may not reflect the broader diversity of the country, meaning results may not generalize to more racially, ethnically, or economically diverse groups. The proportion of women differed between the two treatment groups, which researchers adjusted for statistically, though they note the possibility of sex-specific treatment effects cannot be fully ruled out. Follow-up lasted only a few years, so longer-term biological effects of improved sleep remain unknown. Finally, the study only tested one specific therapy approach, leaving open whether other insomnia treatments would produce similar or different effects on biological aging.
Funding and Disclosures
Funding for the study came from the National Institute on Aging. According to the paper, the funder had no role in the study’s design, data collection, analysis, interpretation, or the writing of the report. The authors reported no competing interests.
Publication Details
Titled “Cognitive behavioural therapy for insomnia and epigenetic ageing: secondary analysis from a randomised controlled trial,” the paper was authored by Judith E. Carroll, Cynthia D. Kusters, Hash Brown Taha, Richard Olmstead, Elizabeth C. Breen, and Michael R. Irwin, based at the University of California, Los Angeles. It was published in The Lancet Healthy Longevity, Vol. 7, in 2026. DOI: https://doi.org/10.1016/j.lanhl.2026.100861. The underlying clinical trial is registered at ClinicalTrials.gov under identifier NCT01641263.
