Hacker News

"What is not known, yet, is whether TUS can induce or stabilize lucid dreams, though the Prophetic team is banking on a positive answer to this open question. Its wearable headband prototype, the Halo, was developed with the company Card79 and can currently read EEG data of users. Over the next year, Prophetic aims to use the dataset from their partnership with the Donders Institute to train machine learning models that will stimulate targeted neural activity in users with ultrasound transducers as a means of inducing lucid dreams."

That's a pretty big caveat. Who the fuck would sign up to be their guinea pig for testing this? A huge part of training these models is providing feedback when it gets things wrong, but we're talking brains here.