The invention relates to a method and device for simultaneous monitoring of cardiac activity, respiratory rate, and the evaluation of sleep states of a user. The invention comprises a seamless on-line evaluation of cardiac activity, heart rate variability, and ECG derived respiratory rate and using these...http://www.google.com.au/patents/US20050148895?utm_source=gb-gplus-sharePatent US20050148895 - Method and apparatus for ECG derived sleep monitoring of a user
