In Touch - 14/09/2010

How those with no light perception are taking melatonin to get a good night's sleep. Dr Victoria Revell of the University of Surrey discusses the use of a drug that is prescription only in the UK. More feedback on our discussion last week about smart phones. Audio description is now standard in the world of TV and film - Tony Shearman reports from the Gielgud Theatre in London's West End where he took a backstage "touch tour" of the musical Hair.