Insomnia is a widespread problem that reflects our busy society. Certain sounds played in-ear at the right moment are capable of promoting sleep. IDUN Technologies is a start-up specialising in in-ear sensors. These sensors detect the electricity that is produced when braincells communicate with each other. Using generative sound, Guardian is able to record, process and interpret brain signals in real-time to improve your sleep. In collaboration with IDUN, I designed a discreet in-ear device that is comfortable to wear while sleeping. A cable connects the two earpieces, and the enclosed electric components are placed on the back of the neck in a braided tube that provides a cushioned feel.