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.
Physical symptoms. Physically, lack of sleep may leave us struggling with low energy levels during the day. Findings from the Great British Sleep Survey show that poor sleepers are twice as likely to feel fatigued. In fact, 88% of poor sleepers struggled with reduced energy compared to only 29% of 'good' sleepers.