Psychiatry.org lists symptoms of depression as feelings of sadness, anger outbursts, loss of interest in activities, and sleep disturbances. Psychiatry.org states the following as symptoms of depression, feelings of sadness, tearfulness, emptiness, or hopelessness, angry outbursts, irritability or frustration even over small matters, loss of interest or pleasure in most or all normal activities such as sex, hobbies, or sports, sleep disservices including insomnia, or sleeping too much.