If you can’t stand the sound of nothingness at night, then you might want a little background noise to help you sleep. Keeping on the tv gives off an obnoxious glow, and turning on the radio can be annoying if a commercial catches you off-guard (not to mention they can both help create some really weird dreams!). To avoid listening to nothing, you can listen to something that is guaranteed not to be too overbearing.
The White Noise Machine has a three inch speaker that will provide you with one of ten different noise tones, and during the day it can act as a portable speaker. There are auto-timers for 30-90+ minutes, volume controls, a playback button, and it can be powered by micro-USB or an AC adapter. This will cost around $60, and is aimed more at those who prefer to listen to music all the time, and can’t stand dead silence.