Yeah - but the only thing, I could do would be my very own stab at a piece of anecdotal evidence.
But cool they really do it in the sleep-lab.

I needed to take a good measure of where I am right now - and then see, if I can raise performance in a way, that transgresses my pretty well documented rate of slow improvement over the last year by a convincing amount.
It had to be a big effect, to make it less probable, that it is down to the phase of learning, I am in.

How to go about defining a result, even if it is only so that I personally would be really convinced of it?

And there are several other problems - first of all - I am pretty lazy with darts at the moment, and I definitively have to keep up with my usual daytime practice.
That was very often an hour a day - sometimes more, but definitively every single day.
And these days I go through several days without throwing. The only thing, still really up and going are my Fridays - a lot of hours then - but otherwise just some here and there.
So if now I do less than I used to irl and some LDing - I might drop, even.

But it combines the two and I hope, with being able to lucid dart - my real life darting motivation will come back up.
Next Friday a couple from England comes joining us for darting, while they are in Berlin - knowing them over the forum - and on the 9th is a tourney..