I get that. I just prefer they stick to researching things that we can control like eating x, y and z decreased risk. Also, stressed out people are I assume more prone to bad dreams and dementia. Maybe that's the link?

It sounds like they’re saying that people who have bad dreams in middle age may be the same people who are more prone to getting dementia in older age, not that bad dreams cause dementia.

It could be just the way the brain operates, nothing we can do about it.

Just what I need. I am a member of the sandwich generation with an impossible parent and many major stressors. How does one not have bad dreams? I get therapy. I meditate. I see friends. Life is tough though and I cannot control the bad dreams.

https://news.yahoo.com/study-bad-dreams-may-lead-163228783.html