1. A device comprising: means for applying an electrical stimulation pulse train from an electrical stimulation device to a patient; and means for adjusting gradually over time a delivery cycle of the electrical stimulation pulse train in response to at least one of a time in a time schedule, user input, or physiological information from a physiological information sensing device, wherein the delivery cycle of the electrical stimulation is a ratio of a first percentage of time during which stimulation pulses of the stimulation pulse train are delivered to a second percentage of time between successive pulse trains during which stimulation pulses of the stimulation are not delivered.