Yes, I experienced it in the past in a concerning way. I wrote a little about my experience on my blog a long while back, but not the most personal details as my blog was read by people I know. In fact, I moved 50 % of my blog posts to a different and new blog. Perhaps I can write more someday as the new blog is more anonymous. Find my post at Obsessive or maladaptive daydreaming easing back into grounded creative thinking | My Journeys Beyond Bipolar Disorder