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.
Some people experience fatigue due to what's known as unrefreshing sleep. This means you've had enough sleep -- usually seven or more hours -- but you wake up and still feel tired, because the sleep was of poor quality, interrupted, or did not reach restorative levels.