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You should use your dishwasher late at night during the summer for several reasons. First, dishwashers have built-in heaters so that they heat the water even more than the water heater does. This creates a lot of heat and humidity which leaks out into your kitchen. This can make you feel uncomfortable and makes your air conditioner run harder. If you use it late, there is less chance that it will cause your air conditioner kick on and less chance that you will adjust your thermostat lower.
Second, the highest peak electricity usage for your utility company is in the afternoon. By delaying your electricity intensive activities until the night, it helps to keep utility rates lower.