A method of affecting a physiological rhythm is provided. The method may include the steps of receiving an indication of a physiological condition of a patient, determining if the physiological condition is outside an expected status, receiving an indication of a physiological rhythm status of the patient, determining a physiological rhythm phase of the patient responsive to the indicated physiological rhythm status, determining a treatment light configured to affect at least one of an advance and delay physiological rhythm response in the patient, and causing the treatment light to be emitted onto the patient.