noun
overactive imagination; tendency to get lost in one's imagination
Refers to a habitual tendency to indulge in unrealistic fantasies or daydreams, sometimes with a slightly negative or clinical connotation.
彼は妄想癖があって、よく現実と空想の区別がつかなくなる。
He has an overactive imagination and often can't tell reality from fantasy.
The writer's tendency to get lost in imagination creates a unique worldview.