When it's very hot out and you do not have air conditioning, it's difficult to fall asleep. You can toss and turn to no avail. All this movement will make you even hotter than you already are, but there are ways to get cool and remain cool long enough for you to fall asleep.
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!
Step2
Try the towel method. Hang a wet towel from two chairs to hold the ice. The melting ice will wet and chill the towel and the fan will blow that cold air on you. Place a container under the towel to catch the melting ice water. You can use a thread to connect the bottom of the towel with the container to avoid the annoying dripping sound.
Step3
Take a shower
Take a cool shower, bath, or wipe your body down with a cool wash cloth. Without fully drying yourself, hop into bed, and let the air slowly dry you. This will keep you cool for a long time, allowing you to fall asleep. If a shower or bath is not an option, splash cool water on your head, and soak your hands and feet in cool water if possible. Your head, hands and feet are your "radiators" and you'll feel cooler faster by focusing on those areas. Note that this method is temporary, and more psychologically sound than physiologically accurate, as a cold shower will close your body's pores, which in the long run will heat your body. Lots of people develop rashes due to heat. Apply talcum powder all over the body after shower to keep body cool and to avoid rashes. There are some special talcum powders available such as shower to shower or a prickly heat powder.
Tips & Warnings
Keep a glass of ice cold water close to your bed so that in the event that you wake up hot and uncomfortable, you can easily cool off again without having to get up.