We heard you, and we want to share (and show) the 5 steps that Zeo takes to phase sleep...
The Zeo headband uses 3 silverized, conductive, fabric sensors to collect the tiny electrical signals naturally produced by your brain, muscle tone and eye movement.
The electrical signals collected from Step 1 are very small - typically 5-100 microvolts (which is about 1/100,000 the voltage of a AAA 1.5 V battery). The next step is to amplify these signals using specialized circuitry.
From the "squiggly line" of Step 2, we need to extract specific "features" (e.g. low frequency, high amplitude delta waves that are indicative of deep sleep) using signal processing techniques like a Fast Fourier Transform (FFT). We end up with a bunch of individual "features" that are associated with different phases of sleep.
By comparing the signal "features" from Step 3 to the desired output from our sleep expert, Walter K. (a.k.a. Wally) using a PSG, we end up with a Neural Network which accurately estimates the probability that you are in a certain phase of sleep.
The Neural Network actually decides what phase of sleep you are in every second of the night, but we smooth out the sleep phases and report the results for every 30 second and 5 minute interval.
Now that you know what we've spent the last 6 years developing, refining, then refining some more (along with a website and coaching program)...we'd love to hear your thoughts, questions and comments. Share your thoughts about Zeo below!