A man lies passed out in his bed, surrounded by discarded cigarette packets and empty bottles. His name is Daniel and he is being harassed by the personification of his hangover. But as the events of last night begin to come out, things take a turn for the worse.This is a sobering and thoughtful hour of theatre. The writer, David Elliot, plays the main character, Daniel. The performance is remarkable for its intensity. As the play goes on its clear that his mind is destroying itself, leaving a shell of a man whose insides are the remnants of the lager he drinks on stage, his late night kebab and his complete inability to appreciate how his actions have consequences. Despite his irresponsibility, Elliot keeps Daniel likable; we want to see him come out of this play all right. Stuart Nicolls anthropomorphised Hangover is wonderfully realised. He is a vengeful and vindictive conscience played with the perfect mixture of violent contempt and wryly observed wit. Its a bravura performance that carries this show and always keeps the audience on the edge of their seats.My issue with Hangover is the writing. On the one hand, its a darkly, darkly comic play. The humour comes from a very true and tragic place that means the audience laughs with the cold dread of recognition rather than actual hilarity. And the shift in tone from comedy to a critical piece of social commentary is subtle and well-handled. But, at the same time, the beat transitions are heavily anecdotal (Remember that time when ?) and Daniels everyman characteristics are worn down by the number of things in his past that tick the boxes: abusive fathers, broken families, divorce etc. These things are offered up as believable reasons for Daniels alcoholism, but the audience doesnt need to hear them. They are carried along by the ingenuity of the piece and prepared to accept Daniels alcoholism as a construct for the show to make its points. And as Nicolls Hangover becomes more aggressive, the show becomes very one-sided, losing some of its earlier complexity.These are minor criticisms. Hangover is a brilliantly realised, desperate plea for common sense wrapped in a heartfelt story of one mans ability to self-destruct. This is a brutally honest, nakedly critical and darkly intelligent production that will stay with you long after you leave the theatre.