Figure 1. Synchronized time series of 28 nights.

Synchronized time series of 28 nights’ values for the apnea-hypopnea index (AHI), percentage of supine body position (Supine) based on total sleep time (TST), percentage of rapid eye movement (REM) sleep based on TST, and percentage of slow wave sleep (SWS) based on TST are presented in four panels. Dashed lines indicate each week of recording.