Modern rhythms lead us to experience a chronic discrepancy between our biological clock and our everyday schedule: we are permanently “jetlagged”. A 10-year study by researchers from the university of Munich published in Current Biology (Till Roennenberg and al.) has identified a “social jetlag” typical from our contemporary societies. It results in lack of sleep, obviously, but also, and above all, health disorders. People with social jetlag are more likely to be smokers, to drink alcohol and a lot of caffeine, and also to become overweight and/or obese.