http://www.homeremediesfordarkcircles.com/ Some of the causes include fatigue and lack sleep. Age is another factor, because the skin under the eyes grows thinner as you get older. Once the skin under your eyes begins to thin, the veins appear to be near the surface. Stress is another factor that can cause the dark circles, and also a lack of sleep. It is advised for everyone, especially as you grow older, to get at least eight hours sleep each night. Doing so will reduce stress levels and give your body the time it needs each night to rebuild itself.