Catching Alzheimer's early means a better opportunity for it to be studied and for treatments to be tried. Researchers have now discovered more evidence that, for some women, poor sleep may be an early sign of the disease. The relationship between sleep and Alzheimer's is difficult to untangle. We know that poor sleep quality increases Alzheimer's risk , and that Alzheimer's interferes with sleep , likely due to the build-up of tau protein tangles in the brain. But whether poor sleep is a risk