The much vaunted.vaunted.discussed Zeo headband [https://www.polyphasic.net/sleep-tracking/zeo-sleep-tracking/], a single lead EEG discontinued 2013. | The much vaunted.vaunted.discussed Zeo headband [https://www.polyphasic.net/sleep-tracking/zeo-sleep-tracking/], a single lead EEG discontinued 2013. |