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.
First, a little biology. As your neurons fire throughout the day, a neurochemical called adenosine builds up in your body. The nervous system uses special receptors to monitor your bodyâs adenosine levels. As the day wears on, more and more adenosine passes through those receptorsâand it makes you sleepy.tâs one of the reasons you get tired at night. Caffeine, however, is a stealthy impersonator. Itâs the same size and shape as adenosine, and when you sip your morning joe, your adenosine receptors canât tell the difference.