There was some work making a version of Edison's technique that actually uses sleep stage data to decide when to trigger the wake up signal: https://www.media.m

There was some work making a version of Edison's technique that actually uses sleep stage data to decide when to trigger the wake up signal: https://www.media.mit.edu/projects/sleep-creativity/overview/#faq-in-laymans-terms-how-does-dormio-work https://www.media.mit.edu/projects/sleep-creativity/overview... One of my friends volunteered for an experiment with this a few years back and said it was pretty trippy. Not sure how the project has progressed since then though.