I'm glad it's a cooler day, sleepie. I lived in India and southern Arizona, and Central Illinois, all of which have their own kinds of extreme heat. Except in the worst humidity, the effect of moving air through water helps. It's lo-tech and is the basis for swamp coolers, if you know what they are.
Wet hair. Put your hair up, then bend over & pour water into it from the back of my neck. If the hair is up tight, it stays wet all day and cools you. If your hair is short, you could try a wet scarf -- like a Sikh turban.
Wearing damp clothes has the same effect. You can spritz your sheets with water.
Hot drinks (tea, coffee) are more cooling than cold ones. All hot climate people know this.
Whenever things are bad, I call for pampering. Call a cab (with a/c) and have it take you to a double matinee at the movies. Movie theaters are always cool!