Polygraphic data was recorded with SOMNOtouch™ NIBP (SOMNOmedics GmbH, Randersacker, Germany) and analysed using DOMINOlight software provided by the same vendor. The polygraphic sensors were attached in the study centre and participants were instructed on how to ensure optimal measurement results. In addition, participants performed multiple blood pressure measurements with an automated oscillographic blood pressure apparatus to allow calibration. Measurement intervals were defined by the time of noise simulation and correlated with sound pressure levels. Sound pressure levels were recorded with a recording sound level metre during the noise simulation in the participants bedroom as described in our previous studies.11 (link),12 (link)