Apparatus, system, and method for monitoring physiological signs

A method for monitoring a subject, the method comprising:

• detecting, with a sensor, a portion of a first output signal reflected from the subject, the detected reflected signal being processed to obtain a bodily motion signal and one or both of a respiratory signal and a cardiac signal;
• and
• deriving, with one or more processors, a plurality of statistical features for a first time period and a second time period, the plurality of derived statistical features comprising statistical bodily motion features derived from the bodily motion signal, the plurality of derived statistical features further comprising one or both of (a) statistical respiratory features derived from the respiratory signal, and (b) statistical cardiac features derived from the cardiac signal;
• selectively combining, with the one or more processors, two or more of the plurality of derived statistical features to estimate a parameter that provides a measure of one or more of a sleep disorder, sleep state, or sleep disturbance;
• and
• providing, with the one or more processors, output representative of physiological information based on one or more of the plurality of derived statistical features or the estimated parameter.

A non-transitory computer readable storage medium containing program instructions for causing at least one processing device to perform a method for monitoring a subject, the method comprising:

• obtaining a signal reflected from the subject using at least one sensor;
• processing the reflected signal to obtain a bodily motion signal and one or both of a respiratory signal and a cardiac signal;
• deriving a plurality of statistical features for a first time period and a second time period, the plurality of derived statistical features comprising statistical bodily motion features derived from the bodily motion signal, the plurality of derived statistical features further comprising one or both of (a) statistical respiratory features derived from the respiratory signal, and (b) statistical cardiac features derived from the cardiac signal;
• selectively combining two or more of the plurality of derived statistical features to estimate a parameter that provides a measure of one or more of a sleep disorder, sleep state or sleep disturbance;
• and
• generating for output physiological information based on one or more of the plurality of derived statistical features or the estimated parameter.