By Mayo Clinic Staff. An X-ray is a quick, painless test that produces images of the structures inside your body â particularly your bones. X-ray beams pass through your body, and they are absorbed in different amounts depending on the density of the material they pass through.
Physical Causes. The most obvious reason for being tired and sleepy is lack of sleep. According to MayoClinic.com, the average adult needs between seven and eight hours of sleep every day. If you're sleeping less than that, adjusting your sleeping schedule might provide some relief.
Second, you will also feel sleepy if you do not meet your body's natural need for sleep. Ongoing sleep loss will typically result in a high level of fatigue. Losing sleep means that your body is going to need even more rest to make up for the debt.