For many people, sleep is seen as a personal and private matter, akin to the intimate aspects of the bedroom. Some might think that this issue is not a true public health priority but rather simply a component of quality of life. In fact, the Law of August 9, 2004, on public health policy makes no mention of it, likely because it is difficult to demonstrate its impact on overall health indicators such as premature mortality rates or the prevalence of morbidity, due to numerous intertwined factors. And yet everyone feels concerned by this issue, since 45% of French people feel they lack sleep and one in three French people report suffering from a sleep disorder. Sleep deprivation and sleep disorders have multiple consequences, beyond the impact on quality of life, and these vary depending on age, social circumstances, and place of residence.