Accuracy is highly important to us. We have conducted a number of studies on the precision of our SoftWave™ sensors, comparing them to other sleep tracking technologies. You can review the preliminary results of a larger study, which is very nearly at the end of data collection. Here are the links to the abstracts:
You can also take a look at the results of another study, conducted and reported by prominent sleep scientist Dr. David White. His study showed excellent concordance with Zeo in phasing sleep. You can find it here:
These reports were presented at the annual meetings of Associated Professional Sleep Societies in 2008 and 2009. More studies are in progress.