Sleep headphones play the same rain loop whether you are wide awake or drifting off. The D1 actually listens. Dry electrodes in the band pick up prefrontal brainwave activity, the on-device model works out what stage you are in, and it shifts the low-frequency sound it is playing to match — nudging you down rather than just drowning the room in white noise. Everything runs locally with no cloud round-trip, which matters when the data is your brain. It is consumer brain-computer interface hardware arriving in the shape of something you would actually wear to bed.
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