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Getting a good night’s rest is essential for a host of reasons. Now, new research suggests an adequate amount of deep sleep could stave off Alzheimer’s.

A group of researchers looked at the relationship between sleep and Alzheimer’s. They found that during deep sleep, the brain goes through a sort of self-cleaning process that could remove toxins associated with the disease.

Researcher Laura Lewis with Boston University told NPR that during deep sleep slow waves appear in the brain just before fluid washes through the brain, which helps clear toxins.

“It’s been known for a long time that sleep is really important for brain health,” Lewis said in an interview with NPR. “But why it is was more mysterious.”

The researchers studied the sleep patterns of 11 people and monitored the liquid in their brain and spinal fluid.

People who have Alzheimer’s are known to have fewer of these slow waves, which means there are less chances for the brain to clear out the toxins associated with the disease.

These waves are associated with memory and other diseases.

Lewis said it’s important not only to get enough sleep, but the right kind of sleep. In order for the brain to produce the slow waves, you must first be in a deep sleep, also known as non-rapid eye movement.

“Some disruption to the way sleep is working could potentially be contributing to the decline in brain health,” Lewis said.

Researcher William Jagust told NPR people may be able to reduce their risk of Alzheimer’s by making sure they are getting enough high-quality, deep sleep.

“There are a bunch of things that are probably contributing to people’s likelihood (of) getting Alzheimer’s,” he says, “and I think sleep is going to turn out to be one of them.”

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