The mystery of dreaming has been a long-held fascination for scientists and philosophers alike. Research has shown that poor sleep – a potential side effect of nightmares – contributes to the development of serious illnesses, including dementia, heart disease, and cancer. But now a new study claims to have found a cure for bad dreams – sound therapy.Registration is a free and easy way to support our truly independent journalismBy registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalistsAlready have an account? sign inRegistration is a free and easy way to support our truly independent journalismBy registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalistsAlready have an account? sign inBad dreams can impact your sleepGetty Images/iStockphoto