1. A medical device system comprising: (a) a brain monitoring element for sensing activity in the brain and outputting a brain signal; (b) a respiratory monitoring element for sensing activity in the respiratory system and outputting a respiratory signal; (c) a therapy module for providing therapeutic output to a brain; and (d) a processor in communication with the brain monitoring element, the respiratory monitoring element and the therapy module, the processor configured to perform the following: (i) detecting a respiratory event in the respiratory signal; (ii) activating the therapy module to provide the therapeutic output to the brain based on detecting a respiratory event; (iii) monitoring the brain signal for an activity indicative of a nervous system disorder; (iv) determining whether an activity indicative of a nervous system disorder has been detected in the brain signal within a specified period of time after detection of the respiratory event in the respiratory signal; and (v) communicating to the therapy module to change the therapeutic output to the brain based upon the monitoring of the brain signal.