Since the sourceforge site seems to stay down, i emailed the support of zeo, here is the answer:
Hi Born,
Thanks for emailing. I’m sorry to hear that you’re having trouble with zeorawdata.sourceforge.net. I have my Web Development team looking into it. In the meantime click here for Zeo Raw Data Library documentation: http://www.sleepstreamonline.com/rdl/
Sleep Well,
Chela
Average ZQ: 90
Zeo Customer Care
They include their ZQ (intends to be something like the IQ of sleeping) in their signature!
But more importantly, i have the documentation! Maybe i start in the upcoming week. The first step will be: Analyze a raw-data file from the sleep-coach and understand the library.