Imagination good for Mental Health

Well, it really depents. I believe having some imagination is good, as it keeps us creative, and dream always come from imagine, where dream is the driving force for many people. However, having too much imagination is bad for our mental health. We tend to imagine good things. However, when the real world is not that case, we feel disappointed. Thus, having too much imagination can cause one to get mad. So, I think as long as your imagination is not out of control, it is good for mental health, but too much is always not good.