In France, in 2005, 18% of people aged 12–75 reported being dissatisfied with the quality of their sleep, and 46% said they had experienced sleep problems in the past eight days. Although the situation has stabilized since 2000, the prevalence of sleep disorders appears to be on the rise compared to 1995, particularly among adolescents. People do not seem to be equal when it comes to sleep: women are more affected by these disorders. Certain sociodemographic factors, such as age, marital status, or unemployment, are particularly significant: separation and widowhood, as well as being unemployed, appear to be life situations that can negatively impact sleep quality. Socio-professional status, however, does not appear to have a significant impact on reported sleep problems. Reports of dissatisfaction with sleep quality or sleep disturbances experienced during the week are particularly high among those aged 45 and older. A higher level of dissatisfaction is also observed among 15- to 19-year-olds, although the prevalence of sleep disturbances does not appear to be higher than among older individuals. [author’s abstract]