Trying to fall asleep in a hot room is one of the cruelest trials that humans are forced to endure. If you don't live in a place with central air, then you're going to be sweating yourself to sleep several months out of the year. OR you can get yourself the EvaPolar evaLIGHT Air Conditioner. This lunchbox-sized personal air conditioner is perfect for cooling off a defined space, and it runs on any USB power source, allowing you to plug it in anywhere. Plus, it's ten times more efficient than most portable ACs. If that isn't enough, it also doubles as a humidifier and dust filter, so you don't have to worry about snoring up any micro-junk while you sleep. You can get one now for just $149, 25 percent off its regular price.