Detecting and treating disordered breathing

A system for treating disordered breathing of a human being comprising:

• a stimulation lead having at least one stimulation electrode, wherein the stimulation lead is configured to be implanted into a blood vessel proximate a phrenic nerve, wherein the at least one stimulation electrode is configured to electrically stimulate the phrenic nerve;
• a sensor configured to detect activity level of the human being;
• and
• an energy source, a pulse generator and circuitry, the circuitry operative to receive a signal indicative of the activity level of the human being from the sensor, wherein the circuitry is configured to:
• cause detection of a hyperpnea episode based on a respiration signal;
• cause the energy source and the pulse generator to trigger and/or terminate a train of stimulation pulses to the at least one stimulation electrode based on the activity level of the human being indicative of sleep,
• wherein the train of stimulation pulses is initiated during the detected hyperpnea episode,
• wherein stimulation pulses in the train of stimulation pulses are substantially uniformly spaced in time, and
• wherein the energy source and the at least one stimulation electrode are configured to deliver the train of stimulation pulses, the train of stimulation pulses configured to extend a duration of time of at least one breath, the at least one breath being defined as a time from an onset of inhalation to the onset of inhalation of a successive breath.