Summit Patel on Instagram: "Prophetic’s Halo Headband is an experimental device designed to help you have lucid dreams (when you realize you’re dreaming). While you sleep it watches your brain activity to figure out when you’re in REM, which is when the most vivid dreams usually happen. When it detects REM, it uses very low-intensity focused ultrasound near your temples to try to “nudge” a part of your brain that’s normally less active during dreams. The company says an AI system called Morpheus