As people grow older, many parts of the body change, including sleep patterns and emotional health. Older adults often report that they sleep less deeply than they did when they were younger.
At the same time, some studies suggest that anxiety and difficulties managing negative emotions may become more common with age. Scientists have long wondered how these two changes might be connected.
A group of researchers at the University of California, Berkeley, recently explored this question. Their study examined whether changes in sleep might help explain why some older adults feel more anxious than others. The findings were published in the scientific journal Communications Psychology.
The research focused on a special stage of sleep known as deep sleep. This stage is also called non‑rapid eye movement sleep, or NREM sleep. During this time, the brain produces slow electrical waves that are believed to help the brain rest and repair itself. These slow waves are sometimes called “slow‑wave activity.”
Deep sleep plays an important role in many functions of the brain. Previous studies have shown that it helps people learn, store memories, and regulate emotions. Scientists believe that deep sleep allows the brain to process stressful experiences and reset emotional responses.
The lead author of the new study, Dr. Eti Ben Simon, explained that earlier research had already shown that deep sleep can help reduce anxiety in younger adults. In those studies, people who experienced stronger slow‑wave activity during sleep tended to feel calmer the next day.
However, scientists were not sure whether the same effect existed in older adults. Aging often reduces the amount of deep sleep a person gets. At the same time, aging can cause small changes in brain structure. Some areas of the brain may shrink slightly over time, a process known as brain atrophy.
The UC Berkeley research team wanted to find out whether deep sleep could still protect people from anxiety even when these age‑related brain changes occur.
To investigate this question, the scientists recruited 61 healthy adults who were all older than 65. The participants reported different levels of anxiety in their daily lives, which allowed the researchers to study a wide range of emotional experiences.
Each participant spent one night in a sleep laboratory. During the night, the scientists measured brain activity using a technique called electroencephalography, or EEG.
EEG involves placing small sensors on the scalp to record electrical activity in the brain. This allowed the researchers to track how much deep sleep each participant experienced and how strong their slow‑wave activity was.
The next morning, the participants underwent brain scans using magnetic resonance imaging, commonly known as MRI. MRI scans allowed the researchers to examine the structure of the brain and measure whether there was any loss of brain volume in areas related to emotion and anxiety.
These two types of measurements gave the scientists a detailed picture of what was happening in both the sleeping brain and the physical structure of the brain.
After collecting all the data, the researchers compared three main factors: the amount of deep sleep people had, the condition of their brain structures, and the anxiety levels they reported.
The results revealed an important pattern. Older adults who had stronger slow‑wave activity during sleep tended to feel less anxious the following day. This relationship remained true even when the researchers took brain atrophy into account.
In other words, even when parts of the brain had shrunk slightly due to aging, deep sleep still appeared to help regulate emotional responses.
Dr. Matthew Walker, the senior author of the study and a well‑known sleep scientist, described deep sleep as a kind of “overnight emotional therapy.” According to him, deep sleep quietly works during the night to help the brain manage stress and keep anxiety under control the next day.
The findings suggest that deep sleep remains a powerful natural tool for emotional balance, even in later life.
The study also highlights an important challenge. As people age, the amount of deep sleep they experience often decreases. This reduction may leave some older adults more vulnerable to anxiety and emotional difficulties.
However, the results also offer a hopeful possibility. If scientists can find ways to improve deep sleep in older adults, it may help reduce anxiety without relying only on medications.
The researchers are now planning future studies to explore whether deep sleep can be strengthened using gentle, non‑invasive techniques. Some experimental approaches use mild sound stimulation or other technologies designed to enhance slow‑wave activity during sleep.
If these techniques prove effective, they could lead to new treatments for anxiety disorders that are connected to poor sleep.
The findings are also important because anxiety in older adults has been linked to a higher risk of cognitive decline and dementia. By improving sleep and lowering anxiety, future treatments might also help protect long‑term brain health.
When reviewing the results of the study, several strengths and limitations become clear. One strength is that the researchers used two advanced technologies, EEG and MRI, to study both brain activity and brain structure. This allowed them to understand how sleep and physical brain changes interact.
However, the study included only 61 participants, which is a relatively small group. Larger studies will be needed to confirm the findings in more diverse populations.
Even so, the research offers strong evidence that deep sleep remains essential for emotional health throughout life. The results suggest that deep sleep is not simply a passive state of rest but an active process that helps the brain manage stress and maintain emotional balance.
As scientists continue to study sleep and mental health, improving deep sleep may become an important strategy for helping older adults maintain emotional well‑being and protect their brain health.
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