Patent attributes
This document discusses, among other things, systems and methods for determining sleep state, such as awake, sleeping, non-REM sleep, or REM sleep. Respiration and heart contractions are monitored. A cardio-respiratory ratio such as beats per breath is computed and used in the sleep state determination. Other information, such as heart rate variability (HRV), posture, and activity level can also be used in the sleep state determination. The sleep state information can be used to qualify or trigger storage of other physiological sensor data, or to permit remote sleep study monitoring of a subject, or to control or adjust one or more monitoring, diagnostic, or therapy algorithms, such as, for example a continuous positive airflow pressure (CPAP) device.
