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I got my Dreem 2 headband two week ago and since then I am using it. It monitors brainwave EEG to monitor sleep stages. Not sure about accuracy but I see it has a live EEG which can detect even your eye blink very accurately. If you wear and see the live EEG and blink your eyes, you can see the wave pattern changes as you blink your eyes. So I assume that it is accurately detecting brainwave.

Apart from detecting sleep stages, it has other features (e.g. smart alarm) which I have not used yet. I really wanted to use sleep simulation which they claim to enhance your deep sleep. But unfortunately this feature in not available in the headband sold in USA.






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