Obviously, because your body is constantly moving, your deep, restful sleep is constantly interrupted--causing excessive daytime sleepiness (and the corresponding need for caffine, WI).

The Epworth Sleepiness Scale (http://www.provigil.com/patient/ask/test.aspx) might be a good place to start if you're concerned, and it sounds as if you might be. At a minimum, it'll give you something to print out and take to your primary care physician when discussing this issue.

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