You may already know that poor sleep, especially in midlife, has been linked to increased dementia risk later down the line.But according to a 2022 study, what you dream about during those crucial hours may also be linked to your likelihood of developing the condition ― especially for man. The paper, published in medical journal The Lancet’s eClinical Medicine, found that middle-aged participants who had nightmares at least once a week were four times more likely to experience cognitive decline (a precursor to dementia) over the following decade than those who did not.The study’s lead author Dr. Abidemi Otaiku recently wrote for Science Alert: “These results suggest frequent nightmares may be one of the earliest signs of dementia, which can precede the development of memory and thinking problems by several years or even decades – especially in men.”How did the study work and what did it fin