Clinical Research Directory

Inclusion Criteria: * Participant must be a shift worker who undertakes extended duration shifts (16 hours or longer) or overnight shifts * Participant must be between the ages of 18-65y * Participant needs to have held a US driving license for two years previously or an International Driving license for two years with 6-months regular (\>2/week) US driving experience * Participants who wear corrective eye wear (i.e., glasses) are ONLY eligible to participate if they have a valid prescription so we can fit the Optalert glasses with their prescription lenses * Resident physicians are only recruited if the combination of their time involvement in the study (i.e., any additional time beyond the time that it would ordinarily take them to commute home from work), together with their scheduled work hours, would fall within ACGME standards for duty hours for resident physicians. Exclusion Criteria: Exclusion criteria includes all parameters outside the inclusion criteria above.