(HealthDay News) -- Here are the latest clinical trials, courtesy of Thomson CenterWatch:
Shingles
If you are 18 or older and have had pain for more than three months after shingles has healed, you may be eligible to participate in this study.
The research site is in Clearwater, Fla.
More information
Please see http://www.centerwatch.com/patient/studies/cat225.html 
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Rheumatoid Arthritis
If you are 18 or older, have been diagnosed with rheumatoid arthritis for more than six months, have not had major surgery within the last eight weeks, and have no other autoimmune disease, you may qualify to participate in this study.
The research site is in Blue Ridge, Ga.
More information
Please see http://www.centerwatch.com/patient/studies/cat132.html .
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Insomnia
If you are aged 18 to 64 and have trouble sleeping, you may be eligible to participate in this study.
The research site is in Houston, Texas.
More information
Please see http://www.centerwatch.com/patient/studies/cat189.html .
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