I also wanted to add another aspect to this test:
The difference between wug-s (voiced fricative, sounds like z) and wug-s (unvoiced, sounds like s).

As an example:
Dogs (dog/z/)
Cats (cat/s/)

The same pluralization rule is applied to both words, but the actual sounds made are different depending on the voicing of the previous sound/letter. You can feel the 'voicing' (vibration) of different sounds by putting your hand on your throat while saying these words.

Also fun fact I have a tattoo of a wug :)

I really enjoyed Lore for a while until he got involved in his TV series. I feel the quality dipped a bit after that (but not a big issue if you're just falling asleep to them).
other similar ones for falling asleep to:
Criminal and This is Love - Pheobe Judge has a great voice to fall asleep to. The content is interesting enough to have your mind not wander too much but her voice relaxing enough to lull you to sleep. I often end up listening to an episode over several bedtimes to hear it all.
Hidden Brain is another great one to fall asleep to.
The Memory Palace, similar to Roman Mars' narrating.

This is great, thank you! They remind me a lot of Ayla Nereo (Hollow Bone album) and I quite like it.