Neurobiological Effects of Light on MDD

The primary study objective is to observe/measure the circadian pattern of sleep, Cortisol and Melatonin in MDD subjects and Control subjects. We will also assess if controlled exposure to light in MDD subjects (post-partum females, non- post-partum females and males) will change these parameters using light glasses. In addition to the biological outcome measures (sleep, cortisol and melatonin) we will also monitor sleep and depressive symptoms in the research subjects for the duration of the protocol.