At a fundamental level, Alzheimer's disease is caused by a progressive loss of functional brain tissue; a treatment to cure moderate or late-stage Alzheimer's disease would have to restore this damaged or lost tissue. Your source is probably saying that there is a treatment to slow or halt Alzheimer's disease. A variety of different interventions that have been studied over the past two decades for the treatment of Alzheimer's disease, and a few of these compounds have been reported to slow the progression of the AD, at least initially. However, no treatment so far has been shown to completely halt or reverse the underlying pathology that develops with this disease, and patients eventually go downhill. I should point out that there are many experimental trials going on. While there is nothing available in the clinic that can halt the progression of Alzheimer's disesae, we remain hopeful that one or more treatments currently in clinical trials will be found to slow or halt the progression of the disease.

There has been a suggestion that Alzheimer's disease can be aggravated by underlying sleep apnea and that the use of continuous positive airway pressure (CPAP), if tolerated by the patient, may improve cognitive function ( http://onlinelibrary.wiley.com/doi/10.1111/j.1532-5415.2008.01934.x/abstract ). In addition, there is discussion that some cases of dementia diagnosed as Alzheimer's disease may actually represent a case of sleep apnea itself as the cause of the mental symptoms. ..Maurice.