13.4 Indications for additional oxygen treatment 302 Anita K. Simonds 13.5 Palliation and advance directives in end-stage disease 305 Anita K. Simonds 14 – Non-respiratory sleep disorders 14.1 Identifying which patients to refer for further investigation 309 Luigi Ferini-Strambi, Francesca Casoni and Maria Paola Mogavero 14.2 Insomnia 316 Luigi Ferini-Strambi, Marco Sforza and Andrea Galbiati 14.3 Restless legs syndrome 321 Ambra Stefani and Ulf Kallweit 14.4 Narcolepsy and idiopathic hypersomnia 325 Ulf Kallweit and Ambra Stefani 14.5 Parasomnia and associated conditions 328 Anna Heidbreder 14.6 Circadian disorders 332 Anna Heidbreder 15 – Medico-legal and organisational aspects 15.1 The medico-legal and socioeconomic impact of respiratory 336 sleep disorders Maria R. Bonsignore, Francesco Fanfulla and Sergio Garbarino 15.2 Organisational aspects in sleep clinics 342 Maria R. Bonsignore, Marta Amata and Giuseppe Adamo 16 – Digital health in respiratory sleep disorders 16.1 Emerging technologies to monitor sleep and circadian rhythms 348 Renaud Tamisier, Sébastien Baillieul and Jean-Louis Pépin 16.2 New digital diagnostic tools for respiratory sleep disorders 354 Renaud Tamisier, Maelle Guellerin and Jean-Louis Pépin 16.3 Digital health innovations for optimisation and follow-up 359 of therapy Renaud Tamisier, Sébastien Baillieul and Jean-Louis Pépin