In Other Words, I'm Screwed
Study Links Daydreaming, Alzheimer's
The part of the brain involved in daydreaming is always active, even if the mind is at rest, said William Klunk, coauthor of the study and associate professor of psychiatry at the University of Pittsburgh. "It's like an engine on idle," he said. "It never shuts down. That activity might fuel the sequence of events that could lead to Alzheimer's."
I suppose I shouldn't be alarmed because everything these days causes cancer or Alzheimer's.. but considering how I can't ever shut off my constantly-running train of thought, and that I live about half my life in mental fantasy of one variety or another, I guess I'll be paying for it later.