We’ve all felt it: that gentle pull toward the couch in the middle of the afternoon, the promise of a quick snooze, the idea that just twenty minutes will make us feel human again. For many older adults, napping is a normal part of daily life—a way to recharge, pass the time, or simply rest tired eyes. But a new study from researchers at Johns Hopkins University is prompting us to look at those daytime siestas a little more closely. The study, published in The Journals of Gerontology: Medical Sciences, suggests that the way older adults nap—how often, how intentionally, and for how long—may be tied to their risk of developing dementia. The researchers followed nearly 1,000 U.S. Medicare beneficiaries who were at least 65 years old and did not have dementia when the study began in 2013. Over a follow-up period of up to ten years, they found some striking patterns. But before we all swear off naps forever, it’s important to understand what this study actually says—and what it doesn’t. The findings are observational, meaning they show a connection, not cause and effect. Still, the results are a powerful reminder that our sleep habits, even the harmless-looking ones, may be telling us something deeper about our brain health.
So what exactly did the researchers find? After tracking participants for a decade, they discovered that older adults who napped frequently—meaning most days or every single day—had a 48 percent higher risk of developing dementia compared to those who rarely or never napped. That’s a substantial jump, and it held up even after the researchers accounted for demographic factors, existing health conditions, and nighttime sleep characteristics. In other words, the link wasn’t simply a matter of older, sicker people napping more. The researchers also looked at whether the naps were intentional or unintentional. Unintentional napping—the kind where you don’t plan to fall asleep but suddenly find yourself dozing off, maybe while watching television or reading—was linked to a 39 percent higher risk of dementia. And even the duration of the nap mattered. Daytime sleeping for 30 minutes or less was associated with a 40 percent higher risk. That last finding might feel counterintuitive. After all, we’ve often been told that short power naps are good for us, and that they can boost alertness and mood. But in this study, even short naps were associated with increased risk, which makes the picture more complicated. It’s not just about how long you sleep during the day; it’s about why you’re sleeping, and what that sleep might represent.
The scientists are quick to point out that the relationship between napping and dementia is likely not a one-way street. In fact, they describe it as a “two-way” association. That means cognitive decline could lead to more frequent napping, and napping could potentially contribute to cognitive decline—both directions may be at play. Dr. Andrew Varga, a sleep neurologist and neuroscientist at the Icahn School of Medicine at Mount Sinai, explained that as dementia-related proteins like amyloid and tau start to accumulate in the brain, and as neurons begin to become dysfunctional or die, some of the first areas affected are the ones that regulate sleep, wakefulness, and the circadian rhythm. This can cause periods of sleep to break through during the day at inappropriate times. In other words, a person who is developing dementia might start napping more because their brain is already undergoing subtle changes—changes that predate any obvious memory loss. That’s why frequent napping could be an early warning sign, not just a bad habit. But because the researchers followed participants who were dementia-free at the start of the study for many years, they believe the findings also suggest that napping patterns themselves might have an influence on dementia development, rather than simply being a reflection of the disease already taking hold. It’s a chicken-and-egg situation, and the honest answer is that both are probably true.
How could napping actually affect dementia risk? One strong possibility, according to study author Adam Spira, a professor of mental health at Johns Hopkins University, is that daytime napping may interfere with nighttime sleep. This matters because disturbed nighttime sleep has been linked to brain changes associated with dementia, including the accumulation of beta-amyloid and increased neuroinflammation. Spira explained that napping may reduce our “homeostatic sleep drive”—the body’s natural pressure to sleep that builds up the longer we stay awake. If we nap during the day, we release some of that pressure, which can make it harder to fall asleep or stay asleep at night. And when nighttime sleep becomes fragmented or insufficient, the consequences ripple through the brain. Dr. Varga added that both sleep deprivation and sleep apnea have been shown to raise dementia risk, with several proposed mechanisms involved: increased production of amyloid and tau, decreased clearance of those harmful proteins from the brain, increased inflammation, and altered immune function. Meanwhile, Dr. Omonigho Bubu, director of the Aging Research in Sleep Equity and Dementia Prevention program at New York University, offered another perspective. He told Newsweek that daytime napping may also reflect underlying sleep disruption, excessive daytime sleepiness, or early neurodegenerative changes that are already affecting the brain systems responsible for regulating sleep and wakefulness. In that sense, he said, “napping may be either a contributing factor, an early warning sign, or both.” So when we see an older adult napping more often, we shouldn’t just tell them to put on a pot of coffee. We should consider what their sleep patterns are telling us about their overall health.
So what should we actually take away from this study? First and foremost, the message is not “never nap.” Many experts agree that not all napping is bad, and there are documented benefits to napping when done in the right context. A short, intentional nap can improve alertness, mood, and performance, especially for someone who didn’t get enough restful sleep the night before. The concern arises when napping becomes excessive, unintentional, or a sign that something else is going wrong. Kening Jiang, the study’s first author and a postdoctoral fellow at Johns Hopkins, emphasized that daytime napping “may be an important potential risk factor for dementia,” and that napping behaviors might help identify older adults who are at higher risk. But he also made clear that “whether daytime napping causes dementia has not yet been established, and more research is needed to understand whether this is a causal relationship.” That’s a crucial caveat. We shouldn’t panic and assume that every afternoon nap is a step toward dementia. Instead, we should view changes in napping patterns as signals worth paying attention to—both for ourselves and for the older people we love. If your elderly parent has always been someone who never naps and suddenly starts dozing off every afternoon, that change deserves a conversation with a doctor. Likewise, if you notice that naps are becoming longer, more frequent, or happening without any intention, it might be worth exploring whether there are underlying sleep issues, medication effects, depression, or early cognitive changes at play.
At the end of the day, this study is a reminder that our brains and our sleep are deeply connected in ways we are only beginning to understand. Sleep is not a passive state; it’s a time when the brain works hard to clear out toxins, consolidate memories, and repair itself. When sleep becomes dysregulated—whether at night or during the day—it can have real consequences. But it’s also important to remember that correlation is not causation. The researchers themselves were careful to stress that their findings were observational and do not prove that napping directly causes dementia. There may be other factors that explain the link, and there is still much we don’t know. What we do know is that healthy sleep habits matter at every age, and that sudden or dramatic changes in sleep patterns can be a window into our overall well-being. So by all means, enjoy a nap if you need one—but try to keep it intentional, moderate, and balanced with good nighttime sleep. And if you or someone you love is experiencing changes in sleep that feel different, don’t dismiss them. Talk to a healthcare provider. Because when it comes to brain health, the little clues—like a daytime nap—might be one of the most important messages your body is trying to send. Think of napping as a clue, not a verdict. It’s not a diagnosis, and it doesn’t mean dementia is inevitable. But it does mean we should listen, stay curious, and, above all, keep prioritizing the kind of rest that truly restores us—both at night and during the day.
