Im new to the alzheimers world since last sept. I've read books on the disease but am wondering if there is a general length of time for the stages beyond the first stage. My mom is, i believe, in stage 3 (maybe 4) ...is 86 and alone, and i am the only child who can provide support/care for her. Im wondering how fast is the progression or is it unique to each individual? Also, i read about the disruptive sleep patterns with those who have the disease and wonder what causes that? Mom hasnt started that yet, but im curious as to what causes it?