Do you have an open-top tank or a proper reptile enclosure? If the former, you can spread a cloth that has been soaked in cold water over the top to help lower the ambient air temperature in the tank. If the latter, you can use a bottle of cold water as described above.
You could also fill the water bowl with cool water, and use a larger than normal bowl.
How cool does it get overnight? Can you open the windows and drop down the house temperature between midnight and sunrise?
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