Inclusion Criteria:  patients undergoing clinically indicated implantation of a Percept™ PC neurostimulator, age ≥ 18 years as well as planned hospitalisation of ≥ 3 days after operation  Exclusion Criteria:  minimal prognosticated survival of less than 1 year, reduced state of consciousness (i. e. Glasgow Coma Scale < 15), inability to communicate (in terms of hearing, seeing, speaking and understanding), other significant concomitant diseases (e. g. cardiovascular disease, infectious disease, isolation), inability to follow procedures, insufficient knowledge of project language, inability to give consent and unlikeliness to follow protocol.