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.
Sleepiness, Medication & Drugs: Why Your OTC Medications And Prescription Drugs Might Make You Tired. Sleepiness is one of the most commonly reported side effects of medications and drugs, and it's an important one to note and discuss with your doctor. Excessive sleepiness can be caused by the sedating effects of nonprescription and prescription medications, and it can also stem from the use of illicit substances.