Fig. 2

Interventions provided by the bed. Participants of the groups snorer one and non-snorer were provided with a stepwise intervention and a random angle intervention. During stepwise intervention, the bed was elevated upon the detection of snoring. If snoring stopped within 5 minutes, the bed went back to P0. Otherwise, the inclination was increased to the next step. During the random angle intervention, the bed went to one of the three inclination angles upon detection of snoring and waited in this position until snoring stopped. The group snorer two got two different interventions. During the small angle intervention, the bed moved to P10 upon detection of snoring and back to neutral when snoring stopped. During the big angle intervention, the bed went to P20