Romberg's Test.. from yahoo health..

What it tests for: Degenerative diseases (or intoxication)

How to do it: Stand with your feet exactly together, arms by your sides. Now close your eyes and stay that way for a full minute. How do you feel: perfectly balanced, or as if you're swaying or falling forward? It's best to do this test with someone watching you to detect swaying. A variation of this test is to do it standing heel to toe on a straight line.

What it means: This test measures proprioception or positioning, considered the "sixth sense" that tells us where our bodies are in space. Proprioception requires accurate sensory input from our joints and muscles and healthy functioning of the dorsal columns of the spinal cord, which allow us to perceive the position of our limbs both in relation to other parts of our bodies and to the environment. When you can't balance with your eyes closed, it's considered a sign of sensory ataxia, or loss of motor coordination, which can be a sign of diabetic neuropathy, multiple sclerosis, inner ear problems, lumbar spinal stenosis, or another degenerative disease. Romberg's test is also sometimes used as a test of intoxication or drug use.

What to do if you fail: It is possible to fail this test when nothing is wrong with you, but -- because it can also indicate a serious condition -- it's worth discussing with your doctor. If you're also experiencing other symptoms, such as numbness, tingling in your arms or legs, or balance problems, ask your doctor for a referral to a neurologist.