This article was migrated. The article was marked as recommended. Background: Ample data demonstrates that sleep deprivation leads to impaired functioning including cognitive performance, memory and fine motor skills. Medical students represent a professional sector in which optimizing cognitive performance and functioning is critical from a personal, public health and safety perspective. Aims: To characterize chronotypes of an international cohort of medical students and determine if chronotype is affected by demographics or latitude. Samples: 328 students from medical schools in the United States (US), Malaysia and United Arab Emirates (UAE) were assessed for differences in chronotype and sleep habits. Methods: A cross-sectional, questionnaire-based study from medical schools in the US, Malaysia and UAE between 2013 and 2015. Results: There was a significant difference in mean waking times for Malaysian students who reported awakening earlier than US or UAE students. Malaysian students were most likely to feel their best earlier in the day and consider themselves a "morning type." UAE students were more likely to do "hard physical work" later in the day, followed by US and Malaysian. On average, US students were less likely to shift their bedtime later if they had no commitments the next day. Overall, mean chronotype score was "neither" type for all three groups however the Malaysian group showed a significant preference for morning hours in some individual questions. Conclusion: Medical student sleep patterns vary internationally but chronotype may not. Improving sleep education globally, with awareness of the effects of chronotype, could ultimately result in improved sleep awareness, potentially influencing physician wellbeing, patient care and safety.