The objective of this study is to characterize the impact of hygienic conditions and lifestyles of students in a vocational school. The study involved 273 students from vocational training certificate programmes (CAP and BEP) and it showed that adolescent and teenage students do not get enough sleep and that most of them skip breakfast and lunch. This behavior partly explains the recurrent difficulties of these students. The French educational system can only lead to an optimal provision of educational opportunities to all students if their lifestyle issues are appropriately addressed and adequately taken into account in the field.