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Young people who prefer to stay up late are more impulsive than their peers who go to bed earlier, which makes them more likely to drink alcohol and smoke, a new study in the journal Chronobiology International, reports. In the first study of its kind, researchers from the University of Surrey and Brunel University London investigated how being an evening type (someone who prefers to stay up late and functions better in the evening) links to impulsivity, anxiety, and substance use. Young people often prefer to stay up late, and those who do are known to be at higher risk of mental health issues and problematic substance use.