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.
Feeling sleepy and tired all the time can be a sign of fatigue. Tiredness and fatigue can manifest in a number of ways. According to eMedicineHealth, fatigue can cause weakness, dizziness, tiredness, shortness of breath and even palpitations.
Quick Answer. A drop in body temperature following the body's natural sleep pattern may cause one to feel tired, according to PubMed of the National Institutes of Health. Lack of activity when one is feeling tired also can contribute to feeling chilled, as muscles generate body heat as they move.