Insomnia may have been torturing humanity since ancient times, but over the last 20 years, scientists have made progress in their understanding of chronic sleep deprivation. Today, sleep deprivation is one of the most widespread reported psychological problems in Britain, with about a third of the adult population in England reporting frequent insomnia symptoms. Insomnia rarely occurs on its own , which brings us to one of the biggest changes scientists have made in our understanding of chronic