In terms of wearables, it's quite unobtrusive because it's literally just a ring. There is no display to become distracted with. The inside of the ring will glow when it's taking measurements (red for blood oxygen, green for heart rate) so that might surprise you when the lights are out, but that's about the extent of how "intrusive" it is.

The battery life is very good, I typically get several days to a single charge, which is far better than the Apple Watch. But most importantly it's comfortable to wear during sleep - indeed it takes the majority of its measurements only while you're sleeping. YMMV but there's no way I can wear an Apple Watch to sleep, while the Oura ring works perfectly. I've worn the last two generations of Oura ring and would definitely recommend.

100% recommended as a non-obtrusive sleep tracker. But it's a bit bulky as a ring (and... it's a ring) so I can't recommend it to the same degree for day-time wear.

> Dexcom CGM

Gen3 app without premium subsciption is very limitied https://youtu.be/c4AVLGwkJHo?t=193