Another symptom of depression is not sleeping very well or sleeping too much. Any solution for a Christian is contained in God's promises. This one is "he grants sleep to those he loves" (Psalm 127:2). Therefore, to overcome this concern "cast all your anxiety on him because he cares for you" ( 1 Peter 5:7).
There are various causes of depression and it will take a doctor to diagnose it. The solution might involve a combination of medicine and counseling. An aspect of the latter is changing cognitive behavior. Stress is a major factor and its possible you precipitate it yourself as with a Type A personality who constantly pressures himself. If "survival of the fittest" is your motivation then stress is very likely to result. Jesus said "all who draw the sword will die by the sword" (Matthew 26:52). "Whatever a man sows, this he will also reap" (Galations 6:7). But the answer is in the other direction for "whoever wants to save his life will lose it" (Mark 8:35). Counseling will give you the chance to change your behavior to alleviate stress and overcome depression. If you cooperate then God "will give you the treasures of [this] darkness" (Isaiah 45:13) for answers. You have the opportunity to learn the meaning of "you are not your own; you were bought at a price" (1 Cor 6:19-20).