A mildly elated state—hypomania, as it is technically called—seems optimal for writers and others in creative callings that demand fluidity and imaginative diversity of thought; it is somewhere toward the peak of that inverted U. But let that euphoria get out of control to become outright mania, as in the mood swings of manic-depressives, and the agitation undermines the ability to think cohesively enough to write well, even though ideas flow freely—indeed, much too freely to pursue any one of them far enough to produce a finished product.
Opposite of anxious/anxiety, hypomania
