“…Unlike bipolar I disorder, which is defined by discrete and full‐blown manic episodes, the conceptualization of SBP (and ‘bipolar II spectrum’) is based on an unstable temperamental substrate in the context of which protracted or brief hypomanic episodes occur with alterations in depression . Indeed, a growing body of evidence suggests that affective temperaments that have genetic underpinnings play a big role in the relationship of morningness‐eveningness to mood fluctuation and in the treatment response , and are associated with comorbid conditions such as alcohol dependence and the metabolic syndrome . Furthermore, such temperamental attributes as mood labile , energy activity , and day dreaming – characteristics of the CT described by Kretschmer – are commonly seen in bipolar II disorder and may be the predictors of switching to bipolar II from depression .…”