By the end of our lives, we will have spent 1/3 of our time sleeping. Sleep is a fundamental human need, but more than half of Canadians report that they cut back on sleep when they need more time to accomplish more during the day. One-third of Canadians sleep fewer hours per night than the recommended number. Yet, sleep is a valuable ally for physical and psychological health as well as for the prevention of health problems. There is still a long way to go to ensure that the need for sleep is recognized by public and health professionals and for it to be considered a critical determinant of health.