1. A medical system comprising: a medical device configured to: deliver at least one of a movement disorder therapy, psychological disorder therapy, or deep brain stimulation to a patient, and monitor a plurality of physiological parameters of the patient, wherein the plurality of physiological parameters includes at least one physiological parameter indicative of patient physical activity; and a processor configured to: determine when the patient is attempting to sleep, determine values of at least one metric that is indicative of sleep quality based on at least one of the physiological parameters and a determination that the patient is attempting to sleep, periodically determine a value of an activity metric based on at least one of the physiological parameters and a determination that the patient is not attempting to sleep, associate each of the sleep quality and activity metric values with a therapy parameter set that was used by the medical device to deliver the therapy when the metric value was determined, and provide the sleep quality and activity metric values with an indication of the association between the therapy parameter sets and the sleep quality and activity metric values for evaluation of the therapy.