Yes, others have experienced this.
Yes, it is a possible symptom of depression.
Yes, unexplained fatigue can be a symptom of other problems such as vitamin deficiencies, anemia (different types), thyroid dysfunction, obstructive or central sleep apnea, etc.

If your situation permits, have a doctor run labs to rule out other reasons for the fatigue. There's no cosmic law that says once you have a depression diagnosis you can't suffer from any other illness. (Pet Peeve: Doctors who know you suffer from depression and therefore read all your symptoms under the depression label.)