A special programme dedicated to mental health, with experts answering questions surrounding the impact that lack of sleep, stress and laughter can have on our mental wellbeing. Michael Mosley runs a big experiment to find out the best way to beat stress, from gardening to yoga, while Dr Zoe Williams finds out why laughing can be as good as exercise for improving moods. Elsewhere, Dr Alain Gregoire tests how lack of sleep affects our mental health, Surgeon Gabriel Weston investigates the radical new treatment that could cure schizophrenia, and Giles Yeo asks if you can eat your way to happiness.