In a method and a system the autonomic nervous system, and in particular parameters reflecting the current condition of the autonomic nervous system, are monitored for detecting a lower level of wakefulness. One such parameter, which has been found to indicate such a state, is cardiac oscillation. Thus,...http://www.google.co.uk/patents/US6337629?utm_source=gb-gplus-sharePatent US6337629 - Method and a system for monitoring a person
