Not about sleep learning but lucid dreaming in general: I have long been puzzled and disappointed that we are not pouring more research, interest, and funding into controlling the induction of lucid dreams. There are ways to learn to do it now, but they are slow and unreliable. Gadgets exist but they're fringe - there is no great lucid dreaming movement like there is with longevity, for example.

I would have thought in a society where we want a gadget or magic pill for anything and everything, our interest in this would be through the roof. You can live a whole other lifetime in a dream, either your own or of some other character or world you step into. You can replay the past see the future, countless times. Controlled lucid dreaming seems like the closest we will likely ever get to immortality. Why aren't we more bullish about facilitating it?