While the times of sunrise and sunset change at roughly equal rates as the seasons change, proponents of Daylight Saving Time argue that most people prefer a greater increase in daylight hours after the typical "nine-to-five" workday. Supporters have also argued that DST decreases energy consumption by reducing the need for <answer>lighting and heating</answer>, but the actual effect on overall energy use is heavily disputed.
What two sources of energy use do DST proponents say are reduced by the time change?
lighting and heating