Why Is Sleep Important?

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Slow-wave sleep (delta) does matter!

Beta amyloid plaque is associated with dementia.

Slow-wave sleep is not a dementia prophylactic.

Let’s start with the obvious truth. Sleep matters. Deep sleep matters.

Now the uncomfortable truth. A recent study claimed, “There’s a critical thing you can do to keep Alzheimer’s symptoms at bay.” We argue that this claim is not science. It’s marketing dressed up like science. It takes a nuanced correlation and sells it like a proven lever. That’s not harmless. That’s how the public gets misled and how families end up chasing false certainty.

What the study actually did

Researchers looked at 62 older adults who were cognitively healthy. No diagnosis. No Alzheimer’s symptoms were being treated. First, they used PET scans to measure beta-amyloid burden, which shows how much sticky protein waste has collected in the brain. That buildup is associated with Alzheimer’s disease, often years before symptoms become obvious, but not necessarily a measure of dementia symptoms. Then they recorded sleep brainwaves overnight to measure slow-wave sleep (SWS; delta waves)........

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