Inclusion Criteria:  less or equal (≤) to 24 weeks postpartum meet criteria for current major depressive disorder per the Structured Clinical Interview for Diagnostic (SCID) and Statistical Manual of Mental Disorders version 5 (DSM-V) not currently receiving treatment for depression (for example, prescription medications or psychotherapy).  Exclusion Criteria:  Current diagnosis of Posttraumatic stress disorder (PTSD), obsessive compulsive disorder, eating disorder, substance abuse or dependence, lifetime history of mania/hypomania or thought disorder per SCID. current diagnosis of, or high risk for, sleep-disordered breathing, insomnia disorder, restless leg syndrome, and/or narcolepsy. retinal pathology or history of eye surgery current use of photosensitizing medications, current use of exogenous melatonin or medications that may interfere with the measurement of melatonin (nonsteroidal anti-inflammatory drugs (NSAIDs) if used daily, and beta-blockers) medical conditions for which bright light therapy is contraindicated (for example, epilepsy/seizures).