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I am familiar with the effects of sleep deprivation and some of the harmful effects of oversleeping. However, I have also heard more than once that sleeping more than 10 hours on average, even for a non-sedentary person, can lower overall brain alertness and acuity. In addition, I have heard that it can cause the premature onset of Alzheimer's disease and other brain-related diseases.

This is something entirely unfamiliar to me and I was wondering: Is this supported by scientific evidence?

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    Wouldn't over sleeping perhaps be a symptom of other issues, such as depression? – JasonR Apr 21 '11 at 13:31
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NO.There has been no research which points to over sleeping leading to brain disorders.

Conversely, certain brain disorders can cause oversleeping.

Oversleeping has been shown to cause diabetics, obesity and other health problems but not any serious brain disorders.

The claim that long sleeps and after noon naps may lead to Alzheimer's disease could in fact be due to the reverse correlation, i.e people who are prone to develop Alzheimer's disease in future are over-sleepers, probably due to other brain related issues (not the other way)

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