Is this really useful? Like, is this something people ever need to do? I don't do lucid dreams very often, but the rare times a dream has lead me to the thought of "hold on, am I dreaming?" were basically immediately answered by just, uh, vibes, I guess? Like, it's always just been instantly obvious that I'm dreaming the moment I'd start questioning it, no tests necessary. At worst I might have to try to remember what I did the day before and what I was supposed to be doing that day and see if that is at all compatible with the scenario I'm dreaming about, which it usually isn't.