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.
Low blood and platelet counts | Cancer Care Program. Low Red Blood Cell Count. A decreased number of red blood cells (anemia) can make you feel tired, weak, chilly, dizzy or short of breath. Here are some things you can do to help yourself feel better. 1  Get plenty of rest, conserve your energy. 2  Alternate rest periods with periods of activity.