There were 3051 drivers (mean age, 46 + 13 y; 75% men) who completed the survey (80% participation rate). Eighty-seven (2.9%) drivers reported near-miss sleepy accidents (NMSA) during the trip; 8.5% of NMSA occurred during the past year and 2.3% reported sleepiness-related accidents occurring in the past year. Mean driving time was 181 + 109 min and mean sleep duration in the past 24 h was 480 + 104 min; mean sleep duration during workweeks was 468 + 74 min. Significant risk factors for NMSA during the trip were NMSA in the past year, non-restorative sleep and snoring in the past 3 months, and sleepiness during the interview. Neither sleep time in the past 24 h nor acute sleep debt (sleep time difference between workweeks and the past 24 h) correlated with the occurrence of near misses.