Apparatus for and method of biotic sleep state determining

A biotic sleep state determining apparatus that determines a sleep state of a subject based on a series of pulse interval data that indicate a time interval of one cycle of a pulse wave of the subject, and on body movement data that indicates a body movement of the subject, the apparatus comprising:

• a body movement determining unit configured to determine that the body movement occurs if a fluctuation amount of the body movement data is greater than a first predetermined threshold;
• a pulse interval data processor that processes the series of pulse interval data after removing pulse interval data measured in parallel with the body movement data from the series of pulse interval data, if the body movement determining unit determines that the body movement occurs;
• a sleep state determining unit configured to determine the sleep state based on autonomic nerve indexes acquired from the series of pulse interval data processed by the pulse interval data processor;
• a direct-current fluctuation component remover that samples a series of pulse wave data from the pulse wave, that differentiates the series of pulse wave data thus sampled by time, and that removes direct-current fluctuation components from the series of pulse wave data;
• a threshold acquiring unit configured to acquire maximum pulse wave data and minimum pulse wave data within a predetermined time interval from the series of pulse wave data, from which the direct-current fluctuation component remover removes the direct-current fluctuation components, and that sets a predetermined value between the maximum pulse wave data and the minimum pulse wave data as a third predetermined threshold;
• and
• a pulse interval data acquiring unit configured to calculate time periods at which the series of pulse wave data coincident with the third predetermined threshold acquired by the threshold acquiring unit occur, from the series of pulse wave data from which the direct-current fluctuation components are removed by the direct-current fluctuation component remover, and that acquires the pulse interval data from an interval of the calculated time periods, wherein the pulse interval data processor that generates the series of pulse interval data from the pulse interval data acquired by the pulse interval data acquiring unit, and processes the series of pulse interval data.

A biotic sleep state determining apparatus that determines a sleep state of a subject based on a series of pulse interval data that indicate a time interval of one cycle of a pulse wave of the subject, and on body movement data that indicates a body movement of the subject, the apparatus comprising:

• a body movement determining unit configured to determine that the body movement occurs if a fluctuation amount of the body movement data is greater than a first predetermined threshold;
• a pulse interval data processor that processes the series of pulse interval data after removing pulse interval data measured in parallel with the body movement data from the series of pulse interval data, if the body movement determining unit determines that the body movement occurs;
• a sleep state determining unit configured to determine the sleep state based on autonomic nerve indexes acquired from the series of pulse interval data processed by the pulse interval data processor;
• and
• a waveform abnormality detector that calculates a degree of coincidence between a waveform of the pulse interval data determined by the body movement determining unit as the body movement, and a waveform of normal pulse interval data, and that detects the pulse interval data determined as the body movement, as a waveform abnormality if the degree of the coincidence is smaller than a fourth predetermined threshold, wherein the pulse interval data processor that processes the series of pulse interval data after removing the pulse interval data detected as the waveform abnormality by the waveform abnormality detector from the series of pulse interval data.