Why do people with dementia have disrupted sleep patterns?

Based on my experience and what I’ve observed and knowing for a fact that melatonin production decreases as we age when somebody has a neurodegenerative disorder the whole brain is under attack, it’s not just memory or confusion which is often what we think of when we hear words like dementia. Another thing that we don’t think about too often is as people are aging, that is often when men started to experience prostate problems which can keep them getting up numerous times during the night that is a problem for sleep obviously. Then also for women who have given birth vaginally, a lot of times they end up with a prolapsed bladder or urge incontinency and so that can keep people awake. Or they start coughing you’re sneezing and they need to get up right away. There are other things too of course like the street light or a lot of environmental factors as well as some biological factors.