Plug in your fan and turn it towards you. Purchase a commercial bag of ice cubes. Empty the entire bag into a wide, shallow container (to contain the water as the ice melts) such as a roasting pan. Place the container of ice right in front of the fan (between the fan and you), at the level of the top of the bed. The ice-cooled air will be noticeably cooler than the room air for the amount of time it takes for the ice to melt -- which is as long as it should take for you to fall asleep!
clipped from: www.wikihow.com