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.
What Happens to Your Body When You are Really Tired? Being really tired can really put a strain on your body and your mind. You may feel groggy, sleepy, or out of focus, and probably will not be the most pleasant person to be around. A lack of proper sleep also effects your body and its natural regulation processes. Long term effects of being really tired are extremely negative and can even lead to some serious health problems.