Though this clip has been out for several years, you (Jody) are still engaging with the comments, so I'll relate a recent anecdote.
I had a sleep study in Dec 2020 and was fortunate to have a personable and very knowledgeable technician who recognized quickly that I could "talk shop" and keep up with the nomenclature of sensors, monitors, and brain functions.  I said I routinely used various binaural recordings to help me sleep, and I asked if it would be okay for me to use a recording for the current study. The tech said I could use whatever sleep hygiene I was accustomed to, and somewhat by chance, I picked this current clip from my favorites. Then he offered that although he wasn't up-to-date with clinical evidence for binaural, he himself had monitored several patients who used binaural recordings and whose delta-wave traces overnight were "thru the roof".  I found that intriguing and am hoping that I'll get to see my own EEGs when I finally have my follow-up appointment with the sleep neurologist -- currently scheduled for early April 2021.  If there's anything pertinent and interesting, I'll post a follow-up comment.
@Omicron Ceti Hey! Sorry I missed this post originally. Definitely interesting. One of these days when I have $100K (or more) to burn, I'd love to have my sleep tracks tested in a laboratory setting. Did you go back for a second night of testing or just the one?
Omicron Ceti