Summary: A new study shows that sleep aids may change the brain’s chemical messengers. That may change brain waves and hurt waste removal during sleep. Over time, this can raise the risk of dementia.
The leading causes of early death, disease, and disability today are chronic diseases that are not infections. Metabolic disorders from poor lifestyle choices are one example. Poor diet and too little exercise are the top causes of chronic health problems. But there are other big causes too, such as high stress and poor or too little sleep. Better sleep, both longer and deeper, could be one of the simplest ways to boost health. How long you sleep is fairly easy to explain. How well you sleep is harder to understand.
Most guidelines say adults should sleep 7 hours or more. But studies show that in the US, about 40% of adults do not sleep enough. This is not just due to work or stress. Heavy use of phones and screens has also made things worse.
But there is another sleep problem. Sleeping 7 hours is not enough. Good quality sleep matters just as much, with enough REM (rapid eye movement) and NREM (non-rapid eye movement) sleep. People go through several sleep cycles each night, including REM and NREM. If these cycles are broken, you do not get enough rest, and that causes harm. So even people who sleep seven or more hours are not always sleeping well. For example, drinking alcohol breaks up sleep cycles.
In the same way, a new study shows that even common sleep aids may break up sleep cycles. We have long known that sleep pills help people sleep enough hours. But that sleep is not always refreshing. People often complain of morning headaches and not feeling rested. Still, many people take these pills by habit without knowing the risks.
New studies suggest that a steady sleep rhythm is key for clearing waste from the brain. Why does that matter? Well, dementia is on the rise, and one reason is more brain inflammation from toxins that build up. Researchers think a major reason for this is too little or poor-quality sleep. Yes, a good night’s sleep may be one of the best ways to lower your risk of dementia.
The brain is one of the most complex organs of all, and science is still trying to understand it. Science still does not fully know how it works. It took a long time to learn that the brain has more glial, or support, cells than nerve cells. That is because nerve cells need a lot of care.
In the new study, researchers found that common sleep aids like zolpidem cut norepinephrine production. This drop in a brain chemical changes brain waves, mostly during sleep. It weakens the waves of NREM sleep, which slows glymphatic flow. Glymphatic clearance is the brain’s main way of removing toxins. So using this sleep aid slows the clearing of toxins.
Of course, things are not that simple. Other experts argue that the benefits of sleep aids outweigh such harms. For example, if a person cannot sleep well without these pills, going without could do even more harm. So you have to weigh things carefully. Still, this study clearly shows that losing sleep and poorer sleep slow the removal of brain toxins. That may raise the risk of dementia in the long run.
Experts are not telling people to stop using sleep aids. They are urging caution. Some people now take these pills all the time. Taking them now and then is unlikely to cause harm. Harm is more likely in people who use sleep aids by habit.
This also shows how many substances that change brain waves may change how the brain works. That can raise dementia risk. Many such factors may badly disrupt the brain and cause real harm. Added together, their effect is large.
Frequently asked questions
Do sleeping pills cause dementia?
Habitual use is the concern. In the new study, common sleep aids like zolpidem cut the brain’s output of norepinephrine. That weakens the brain waves of non-REM sleep. It slows the glymphatic system that flushes toxins out overnight. Toxins that stay behind feed brain inflammation. Over years, that raises the risk of dementia.
How does the brain clear waste during sleep?
Through glymphatic clearance, the brain’s main way of removing toxins. During non-REM sleep, norepinephrine drives slow waves that move this cleaning system. It depends on a steady sleep rhythm with enough REM and non-REM cycles, not just enough hours. Alcohol and sleep aids both break up those cycles. So seven hours in bed does not promise a clean brain.
Is it safe to take a sleep aid every night?
The risk is for nightly, habitual users. Taking a pill now and then is unlikely to cause harm. The answer is not to stop cold. For someone who cannot sleep at all without pills, going without may do more damage. Weigh it carefully, and use caution before making a sleep aid a nightly habit.
Source: Hauglund, N. L., Andersen, M., Tokarska, K., Radovanovic, T., Kjaerby, C., Sørensen, F. L., Bojarowska, Z., Untiet, V., Ballestero, S. B., Kolmos, M. G., Weikop, P., Hirase, H., & Nedergaard, M. (2025). Norepinephrine-mediated slow vasomotion drives glymphatic clearance during sleep. Cell, 0(0). https://doi.org/10.1016/j.cell.2024.11.027
Dr. Gurpreet Singh Padda, MD, MBA, MHP
