I some times wake up at night with a fever (100.3-101.5) bodyaches & chills. then a few hours later i wake up soaked, no fever. what may be going on?

See your doctor.: The most common cause of this would be a viral or bacterial infection, and usually resolves in 1 week if it is viral and may need antibiotics if it is bacterial. Fever is never a normal finding and should be evaluated as soon as possible by a doctor. In rare cases, fever, night sweats, and weight loss are usually associated with Grade B symptoms of lymphoma.

A number of things: The first thing you always think of with a fever is an infection going on somewhere in your body.Tuberculosis and abscesses are the most common infections in people with fever of unknown origin.Connective tissue diseases,certain cancers, thyroid problems, and familial mediterranean fever are other possibilities.You should see your doc and have some tests run to rule these things out .