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 first thing you should know is, feeling sleepy in the afternoon is normal. It doesn't mean you had a big lunch, or that you're depressed, or you're not getting enough exercise. That's just how animals' cycles work -- every 24 hours, we have two periods of intense sleepiness.