I created a thread last year for this but I can't find it now. Anyway it will be out on DVD soon and I finally saw it the other day. I really enjoyed the movie, by the trailer you may think it's just another one of the same movies that look like it, but it doesn't follow the formula at all. I really liked the main character Stephane and I thought his acting was incredibly well done. It's not quite as good as Eternal Sunshine (same director) but all the same I really liked it and it's now one of my favorites of 2006.
here's the trailer for anyone who forgot what this was:
Apple - Trailers - The Science of Sleep