My colleague is known for liking a drink and I and others have smelled drink on him on previous occasions. However, over the past fortnight his behaviour has become more hyper at work as if he wasn't just nursing a hangover but was actually still perhaps drunk? Another colleague suggested that maybe he was drinking at work so we decided to go and look in his backpack and there was an empty kids drinks bottle with a tiny bit of wine left in it. So he is drinijng on the job. So do we do anything or mind our own business? He's a nice guy on the whole. I'm thinking say nothing, I need advice.