By Joseph Wilkinson From New York Daily News Don’t sleep on this research. Excessive napping among older adults is strongly correlated with increased risk for Alzheimer’s disease, according to a study published Thursday. Elderly adults who averaged more than an hour of sleep during the daytime were 40 percent more likely to develop signs of dementia than people who didn’t nap or napped less than an hour, the study in Alzheimer’s and Dementia: The Journal of the Alzheimer’s Association found. Researchers described it as a “vicious cycle”: More sleep led to an increased risk for dementia, and more dementia led to more sleep for study participants. “The vicious cycle we observed between daytime sleep and Alzheimer’s disease offers a basis for better understanding the role of sleep in the development and progression of Alzheimer’s disease in older adults,” lead researcher Peng Li said. More than 1,400 people, with an average …