FIGURE 2.
A rocking bed was used to provide vestibular stimulation at three levels of intensity. (A) Picture of the Somnomat rocking bed (here not located in the sleep laboratory) performing a side-to-side motion along a pendulum trajectory. (B) Participants were divided in a group having a nap opportunity with low intensity stimulation (n = 10) and a group having a nap opportunity with high intensity stimulation (n = 12), all participants additionally had one control and medium intensity stimulation nap opportunity. Recorded sound of the bed was played back during the control condition.