Introduction: Anxiety is a phenomena that affects mental health and sleep. It is more noticeable at students and high-schoolers, this period being characterized by high level of stress. Physical exercises were proposed to improve the negative impact of anxiety on sleep and cognitive processes. Materials and methods: Tranversal study on 84 persons (34 medical students from II year, 50 twelfegraders). There were used 3 questionnaires: Spielberger's The State-Trait Anxiety Inventory, The Pittsburgh Sleep Quality Index, Dijon Score for the level of physical training. Results: Physical training (PT)- anxiety level - from those with poor PT (7,23 %)- all present severe anxiety (100%), medium PT (51,81%) -severe anxiety (57%) and moderate anxiety (43%), and only in the group with good PT (40,96%) students present normal anxiety level (9%). Physical training (PT) - sleep efficacy (SE) - the majority of students with good PT have a high SE (86%), group with medium PT shows high SE for all students, and those with poor PT- 25% show a low SE. Anxiety level - sleep latency (SL) -students with normal anxiety show a medium SL (47%), those with moderate anxiety present a minimum SL (44%) and medium SL (41%), and a number of students with severe anxiety show minimum SL (67%), others increased one (33%). Conclusions: Sleep latency is increased by the high level of anxiety, whereas the total time of sleep is decreased. Physical exercises reduce anxiety and enhance the sleep quality. Thus, the correlation physical activity- anxiety reduction- improvement of sleep quality, was demonstrated. Acknowledgements: professors from USMF " Nicolae Testemitanu"