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.
Hypersomnia is a sleep disorder that causes a person to want to sleep at inappropriate times. While many people can be over tired or get sleepy in the middle of the day, hypersomnia is different. Those with this sleep disorder suffer from a debilitating tiredness despite getting a good nightâs sleep.