Depression dominates the clinical presentation of bipolar disorders, occupying the vast majority of the syndromal and subsyndromal affective burden of this illness. 1 In addition to the symptoms themselves, bipolar depression (BPD) is associated with cognitive impairment, occupational disability, medical morbidity, and suicide. 2 The treatment options for BPD are limited by suboptimal efficacy, pharmacologic side effects, mood destabilization, and delayed therapeutic response. 3 Although pharmacotherapies are the predominant modality of treatment, alternative biological interventions are also available. Chronotherapeutic treatments are a set of interventions that are thought to act on the biological clock. In psychiatry, these interventions are used primarily in the management of affective illness. 4