You can use an app for almost anything these days, but controlling your subconscious? Hakuhodo's Future Technology Works division thinks it can do that, too. Its Yumemiru is an app that's claimed to have the power to influence what you dream about. Users select from eight different scenarios (including romance, flying and walking in a forest), settle down for a nap and the app creates appropriate sounds aimed at determining the subject of their dreams.
There's also an alarm, so after your night of iPhone-influenced dreaming you can wake up and share how great your dream was on Facebook. Now that's what we can a nightmare scenario.
For non-Japanese speakers, just be patient. The English version is coming soon.