Naps are OK, but keep them short and early in the day. Take breaks when you need them. Use medications properly. In addition, some cold medications and pain relievers contain caffeine and other stimulants that can interfere with sleep. Take your medications as prescribed, and talk to your doctor if you suspect that your medications are contributing to fatigue.
Fatigue can be a symptom of illness.
In general, see your doctor if your fatigue is excessive or persists for several weeks. Fatigue that's accompanied by sadness, loss of appetite, loss of pleasure in activities, difficulty concentrating and interrupted sleep may be a sign of depression. Signs of this disorder include loud snoring, pauses between breaths and awakening frequently while gasping for air. It's a common but often undiagnosed source of fatigue because it interferes with sound sleep. It's especially prevalent among overweight adults.