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.
The Scientist: Michael J. Breus, Ph.D., a clinical psychologist and Fellow of the American Academy of Sleep Medicine. The Answer: If you got more sleep than youâre used to last night, then youâre probably tired because you got more sleep than youâre used to last night. Your body loves consistency. It prefers when you go to bed and wake up at the same time each day.