A system comprising: a waveform acquisition apparatus (100, 200) configured to record a physiological signal (600, 801) during discrete time separated detection windows; and an analyzer, comprising: first processing circuitry able to derive one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) from the recorded physiological signal (600, 801) and configured to output a respiratory disturbance state when the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) deviate from a threshold value; second processing circuitry configured to interpolate the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) between ending and beginning states of adjacent time separated detection windows, based on the ending states of the adjacent time separated detection windows; and third processing circuitry configured to declare a respiratory disturbance episode based on the respiratory disturbance state during the detection windows and the interpolation between ending and beginning states of adjacent time separated detection windows; wherein the waveform acquisition apparatus (100, 200) is configured to: shorten a duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a respiratory disturbance state by the first processing circuitry; and lengthen the duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a normal breathing state by the first processing circuitry; and wherein the third processing circuitry is configured to declare the respiratory disturbance episode if the respiratory disturbance state is present in both the ending state and the beginning state of adjacent time separated detection windows. a waveform acquisition apparatus (100, 200) configured to record a physiological signal (600, 801) during discrete time separated detection windows; and an analyzer, comprising: first processing circuitry able to derive one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) from the recorded physiological signal (600, 801) and configured to output a respiratory disturbance state when the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) deviate from a threshold value; second processing circuitry configured to interpolate the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) between ending and beginning states of adjacent time separated detection windows, based on the ending states of the adjacent time separated detection windows; and third processing circuitry configured to declare a respiratory disturbance episode based on the respiratory disturbance state during the detection windows and the interpolation between ending and beginning states of adjacent time separated detection windows; first processing circuitry able to derive one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) from the recorded physiological signal (600, 801) and configured to output a respiratory disturbance state when the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) deviate from a threshold value; second processing circuitry configured to interpolate the one or more respiratory disturbance indices (911, 912, 913, 914; 1011, 1012, 103, 1014; 1111, 1112, 1113, 1114) between ending and beginning states of adjacent time separated detection windows, based on the ending states of the adjacent time separated detection windows; and third processing circuitry configured to declare a respiratory disturbance episode based on the respiratory disturbance state during the detection windows and the interpolation between ending and beginning states of adjacent time separated detection windows; wherein the waveform acquisition apparatus (100, 200) is configured to: shorten a duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a respiratory disturbance state by the first processing circuitry; and lengthen the duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a normal breathing state by the first processing circuitry; and shorten a duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a respiratory disturbance state by the first processing circuitry; and lengthen the duration between adjacent time separated detection windows in response to the ending state of one of the adjacent time separated detection windows indicating a normal breathing state by the first processing circuitry; and wherein the third processing circuitry is configured to declare the respiratory disturbance episode if the respiratory disturbance state is present in both the ending state and the beginning state of adjacent time separated detection windows.