Chronic fatigue
Depression is not only about mental or psychological changes. It also has several physical symptoms patients can report to the doctor. Chronic fatigue is often a clinical finding in major depression, and may or may not be associated with changes in the sleep pattern. Independently of how much the patient is able to sleep, they feel drowsy and tired after waking up and throughout the day. Their energy levels experience a progressive drop as the disease advances further.
Chronic fatigue in depression may be related to sleeping problems, but it is also caused by a constant struggle to overcome the stress your mood problems are causing to your brain and the rest of the body.