My sleep monitoring machine arrived – complete with a blood oxygenation sensor (which attaches to a finger) and an airflow meter which is a little tube that runs up to under your nose, and has another couple of smaller tubes that fit into your nostrils. I made Fremen/Dune jokes while wearing it.
Anyway, I spent the night with these things attached and have mailed it back to them – I toss and turn so much that the fremen tube came out a LOT, and I had to put it back in each time I realised. I hope they got SOME usable data out of it – it’d such if I sleep so badly that it’s out of scope of such portable equipment and I have to go into a clinic and have more serious gear attached.