The investigators regret that this study does not permit participation by women who reside outside of the areas easily accessible to our research sites in New York City, New Haven and Pittsburgh. As this is still an exploratory treatment approach, light therapy is not yet widely offered as an open treatment for antepartum depression in clinical practice and the light boxes we are testing in this study are not commercially available. Women with depression who are unable to participate in this study are strongly encouraged to discuss treatment of their discomfort with their obstetrician and/or psychiatrist or psychologist.