RT Journal Article SR Electronic T1 Incidence of and risk factors for nodding off at scientific sessions JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1443 OP 1445 DO 10.1503/cmaj.1041570 VO 171 IS 12 A1 Kenneth Rockwood A1 David B. Hogan A1 Christopher J. Patterson A1 for The Nodding at Presentations (NAP) Investigators YR 2004 UL http://www.cmaj.ca/content/171/12/1443.abstract AB We conducted a surreptitious, prospective, cohort study to explore how often physicians nod off during scientific meetings and to examine risk factors for nodding off. After counting the number of heads falling forward during 2 days of lectures, we calculated the incidence density curves for nodding-off episodes per lecture (NOELs) and assessed risk factors using logistic regression analysis. In this article we report our eye-opening results and suggest ways speakers can try to avoid losing their audience.