Hi, we have a friend who is acting unusually and has become obsessed with an idea to start a business, which to us sounds rediculous but to her is the perfect solution to solving world problems. Her sense of humour seems to have gone, especially when talking about this subject. She is hyperactive and not sleeping properly. She has even given up one of her jobs to work on her 'project'. We don't think it is drink or drugs because her behaviour is unlike anything we've seen. We are concerned that she might have some kind of delusion. We don't know how to help her. What do you think? Thank you.