 I wasn't trained when I was a clinical psychologist to treat sleep problems and yet when I was seeing patients they were often telling me about their sleep problems. I'm Daniel Freeman, I'm a professor of clinical psychology at the University of Oxford and also a consultant clinical psychologist. Historically sleep problems in patients with mental health problems have been overlooked and we want to turn that on its head. Many people with severe mental health problems have difficulties with sleep, either sleeping too little, too much, at the wrong time or very disrupted sleep and I think what was pretty clear is that if you're not sleeping well, you're cognitive functioning, your attention, your memory gets affected. So we're conducting a really large multi-center clinical trial with over a thousand patients at the early stages of psychosis. This is the largest ever trial of sleep treatment for people with severe mental health problems and what we want to show is that you can really successfully treat those sleep problems with psychological treatment and that there's a whole range of other benefits for patients.