GLaDOS has altered the stasis beds within the relaxation vaults, and now GLaDOS has control over the test subject's dreams. Obviously, GLaDOS wants to make even more tests, and she has now forced the test subjects to test 24/7.
However, you are the first test subject ever to experience dream tests, and GLaDOS isn't exactly experienced with this technology.
If you're not hearing a voice in the beginning of the level, open up the console (the "~" key) and type "snd_rebuildaudiocache" without the quotation marks. When the icon in the upper right corner turns orange you may load the map using the console.
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Update:|
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In a few days you will find a link here with a small extra "thing" that I made in the meantime. Stay tuned!