The UCSF Pain Clinical Research Center (PCRC) will be conducting this investigator-initiated 9-week, randomized, double-blind, placebo-controlled, parallel group study of Levetiracetam. There will be a total of 6 study visits. Visit 1 is a screening visit to assess subject eligibility, followed by a one-week period of baseline daily pain and sleep assessments. Visit 2 (one week after Visit 1) subjects will be randomized in a 3/2-randomization scheme and administered study medication. Subjects randomized to the treatment group will start Levetiracetam at 1 tablet of 500/mg/day, and will titrate by 500mg each week to a maximum dose of 3000 mg/day. Visits 3, 4, 5, and 6 (occurring 2, 4, 6 and 8 weeks after started study drug) include safety and efficacy assessments. Study drug taper is initiated at Visit 6.