RainDrop.

I was thinking this may help John get some sleep, and it's quite interesting.
Name:RainDrop
License:Gnu/GPL
Website:Here
PortableFreeware Link: http://portablefreeware.com/?id=869
Description:An application, written in Borland Delphi, whose aim is to produce natural ambient sounds along with some special stimulating sounds for deep relaxation, sleep induction and perceived noise suppression. It is bundled with a series of highly realistic sound sets (tropical rain, birds, etc...), meditation loops (mantra chants, instrumental vibrations, etc...) and a binaural beats generator. Binaural beats are perceptive illusions that happen when your ears receive two slightly different sine waves and your brain erroneously "reconstructs" the signal as a "beat" (hence the name). Depending on its frequency (which is given by the difference of the two sine waves) the binaural beat can effectively change the alertness state of your brain, thus inducing fast reactions (high frequencies), mild relaxation (medium frequencies) or deep sleep (low frequencies).
Language it's written in:Borland Delphi
Other:According to PortableFreeware, you need to extract it this way to make it portable:Download the installer and extract to a folder of your choice. Delete $PLUGINSDIR and [NSIS].nsi. Run WvUnpack.bat to convert the .wv files to .wav. After that, you can delete WvUnpack.bat and WvUnpack.exe. Launch Raindrop.exe.
I'm still not sure of it's full portability, so I'm asking someone to test it (my dad won't let me install anything onto the computer, that's the whole reason I got PortableApps).
Thanks in advance (even if it never becomes a beta test)!