If your bed looks like this, you may want to lose a few pillows.
Note: We are assuming you cannot/don't use/own an air conditioner.
"Active" methods. These methods will get you cooler quicker but will last only for a pre-determined amount of time.
1. Simulate "AC". Purchase a bag of ice, or make your own, then place ice into a shallow bowl. Place the shallow bowl in front of a fan facing your direction. The ice will surprisingly decrease the air temperature as the fan blows the newly cooled air towards you. While it won't make the temperature suddenly become -55 degrees, it'll be a lot cooler.
