Halo by Prophetic: Ultrasound for lucid dreams. Sleep revolution: Control your dreams. Sign up, $100 deposit, free app for first 1,000. Shipping in 2025. In a groundbreaking development, Prophetic, a visionary tech company, has unveiled its latest creation, the “Halo” – a cutting-edge neurotech wearable designed to induce and stabilize lucid dreams using a combination of ultrasound and machine learning