Yes, but only if combined with other symptoms. Too little sleep or on the other hand sleeping too much can be a sign of depression as well as feelings of sadness, emptiness or hopelessness. Appetite changes also may indicate depression, combined with a lack of concentration or forgetfulness. A primary indicator of depression is fatigue no matter how much rest is obtained, which can make you feel that you have less energy to pursue previous activities you once enjoyed.
Reference: Jolly, C.D. (1996) Points about stress. In C. Ouverson (Ed), Stress---taking charge series, PM 1660a Iowa State University Extension