Comment by nonameiguess

It's just a few paragraphs in. The researchers asked yes or no questions and gave some math puzzles to people sleeping. A few remembered. A few were able to answer but didn't remember. It's probably important to remember your entire brain doesn't just stop working and signals still go in and out even though the attentional part we usually think of as ourselves are not aware of it (assuming it's not a lucid dream).

On other hand, I used to have a long-distance girlfriend 25 years ago and we'd talk on the phone before falling asleep and attempt to induce ourselves into having the same dream and seeing each other in it, a la Wheel of Time, which sometimes worked, but of course that kind of communication between two sleepers isn't real, just a testament to the power of suggestion, especially while hypnogogic.