In the Original Contribution by Avorn et al titled “Sudden Uncontrollable Somnolence and Medication Use in Parkinson Disease,” published in the August issue of the ARCHIVES (2005;62:1242-1248), the column “Hoehn and Yahr Score” in Table 3 contains incorrect values. The corrected Table 3 appears in a letter from Avorn et al on page 467.