• Smelling of alcohol
    
• Wanting to stay over in friends’ houses, especially after discos or parties
    
• Suddenly using breath mints or brushing teeth more often
    
• Using too much perfume or aftershave
    
• Becoming very secretive (more so than usual)
    
• Lacking co-ordination in speech and movement
    
• Being excitable, giddy or moody
    
• Changing sleep patterns or being tired during the day
    
• Lacking interest in anything
    
• Getting poor grades and skipping school
    
• Borrowing money
    
• Stealing and lying

Some of these signs may be similar to the normal behaviour changes that teenagers go through, so it is important not to jump to conclusions.