Older people who spend less time in slow-wave sleep—the deep sleep you need to consolidate memories and wake up feeling refreshed—have higher levels of the brain protein tau, a new study shows.
Elevated tau, a sign of Alzheimer’s disease, links to brain damage and cognitive decline.
Poor sleep is a hallmark of Alzheimer’s disease. People with the disease tend to wake up tired and worsening memory loss make nights even less refreshing. But how and why restless nights are linked to Alzheimer’s disease is not fully understood. The new research may have uncovered part of the explanation.
“What’s interesting is that we saw this inverse relationship between decreased slow-wave sleep and more tau protein in people who were either cognitively normal or very mildly impaired, meaning that reduced slow-wave activity may be a marker for the transition between normal and impaired,” says first author Brendan Lucey, an assistant professor of neurology and director of the Sleep Medicine Center at Washington University in St. Louis.
“Measuring how people sleep may be a noninvasive way to screen for Alzheimer’s disease before or just as people begin to develop problems with memory and thinking.”
The brain changes that lead to Alzheimer’s, a disease that affects an estimated 5.7 million Americans, start slowly and silently. Up to two decades before the characteristic symptoms of memory loss and confusion appear, amyloid beta protein begins to collect into plaques in the brain. Tangles of tau appear later and atrophy of key brain areas follows. Only then do people start showing unmistakable signs of cognitive decline.
The challenge is finding people on track to develop Alzheimer’s before such brain changes undermine their ability to think clearly. For that, sleep may be a handy marker.
To better understand the link between sleep and Alzheimer’s disease, researchers studied 119 people 60 years of age or older recruited through the Charles F. and Joanne Knight Alzheimer’s Disease Research Center. Most—80 percent—were cognitively normal, and the remainder were very mildly impaired.
The researchers monitored the participants’ sleep at home over the course of a normal week. Participants strapped a portable EEG monitor to their foreheads to measure their brain waves as they slept, and wore a wristwatch-like sensor that tracks body movement.
A simple question—”How much do you nap during the day?”—might help doctors identify people who could benefit from further testing.
Participants also kept sleep logs and made note of both nighttime sleep sessions and daytime napping. Each participant produced at least two nights of data; some had as many as six.
The researchers also measured levels of amyloid beta and tau in the brain and in the cerebrospinal fluid that bathes the brain and spinal cord. Thirty-eight people underwent PET brain scans for the two proteins, and 104 people underwent spinal taps to provide cerebrospinal fluid for analysis. Twenty-seven did both.
Quality not quantity
After controlling for factors such as sex, age, and movements while sleeping, the researchers found that decreased slow-wave sleep coincided with higher levels of tau in the brain and a higher tau-to-amyloid ratio in the cerebrospinal fluid.
“The key is that it wasn’t the total amount of sleep that was linked to tau, it was the slow-wave sleep, which reflects quality of sleep,” Lucey says. “The people with increased tau pathology were actually sleeping more at night and napping more in the day, but they weren’t getting as good quality sleep.”
If future research bears out their findings, sleep monitoring may be an easy and affordable way to screen earlier for Alzheimer’s disease, the researchers say. Daytime napping alone is significantly associated with high levels of tau, which suggests a simple question—”How much do you nap during the day?”—might help doctors identify people who could benefit from further testing.
“I don’t expect sleep monitoring to replace brain scans or cerebrospinal fluid analysis for identifying early signs of Alzheimer’s disease, but it could supplement them,” Lucey says. “It’s something that could be easily followed over time, and if someone’s sleep habits start changing, that could be a sign for doctors to take a closer look at what might be going on in their brains.”
The study appears in Science Translational Medicine.
The National Institutes of Health, the Ellison Medical Foundation, the Willman Scholar Fund, the Foundation for Barnes-Jewish Hospital, and a Physician Scientist Training Award from the American Sleep Medicine Foundation funded the work.