The 19th composer John Field was the first to name his gentle and delicate piano pieces ‘nocturnes’. The word – and the genre of ‘sleep music’ – it presaged, is ubiquitous today The 19th composer John Field was the first to name his gentle and delicate piano pieces ‘nocturnes’. The word – and the genre of ‘sleep music’ – it presaged, is ubiquitous today O ne of the most familiar topics of our time is the trouble many of us have in winding down at the end of the day. Insomnia is rife: crossing