I’ve heard a number of friends benefit from white noise as an aid to sleep. It somehow cuts out sudden disturbing sounds and street noise that could disrupt your sleep.
I’ve made a minute-long white noise file that you can download to your mp3 player or iPod and play it on loop to have a continuous sound while you nap.
You can download it from here: http://soundcloud.com/grooveyantra/white-noise-aid
After you follow the link, look for a down arrow button for download in the set of above the waveform.
You can also use it as an aid to privacy, where you can play the sound loud in a loop to drown out (to the outside world) any private conversations you have.
Please leave a comment if it helps you.