'Shawty, you gotta go low, low, low,' when it comes to the temperature that you sleep at. If it's boiling hot or freezing cold, it's natural for you to NOT fall asleep. Most people prefer sleeping at 18-20 degrees and this is actually considered as the ideal temperature to fall asleep in. So, set your AC to this temperature, make sure your room is dim and you'll drift away to sleep in no time.