"Lowest Volume"?? I cannot be the only one...

That reading is appropriately 2 feet away from speaker to head (on pillow).

@Yanno 

Ah it’s not all that loud then - what you might call ‘quiet room’ average noise level similar to a ticking clock in the room - I would perhaps try to move the speaker further away if your head is only 2 feet away from it. That should (hopefully) improve things for you. 
 

I get around 30dB from Apple Music ‘Pop Hits’ type playlist on a Sonos Beam/Surrounds/Sub Mini. That’s from 6 feet away, just as a comparison. I’m okay with that output level. I’d be fine upto 40dB but would just move the speaker to another (more distant) location to solve the matter anyway, or play something that’s naturally quieter at night.
 

Stop trying to justify why they haven’t fixed it yet. A speaker should have granular volume control. If I want to sleep with music I expect to be able to do so without disturbing others, I’ve had complaints from neighbors about this. It’s very frustrating how some of you think people are that inept at tech that they can’t even lower the volume correctly. It’s without a doubt way too loud for these scenarios. Try setting your phone on lowest volume and tell me if any sonos speaker can get that low. It should, but it can’t. I’ve waited years for this. It’s not firmware specific. 

This has already gone forward as a feature request, but as the Staff mention in the below link these things are currently ‘by design’ and it may not be changed - the answer is to perhaps position yourself further away if you find it too loud at 1% - personally speaking I’m okay with it in our main bedroom HT setup with Beam, Ones and Sub Mini. The dB level is 30 or often less, on average. 

As a software developer, I know that things that are ”by design” are often a result of a codebase that is too deep into development to change core functionality without much effort. What we see here is that Sonos does not care to meet customer dissatisfaction with a solution that caters to this group of people. Others and myself included deem the volume too high at 1%. This has been an issue before 15.2. Stop being ridiculous and defend a company the size of Sonos and try to tell me that they cannot provide a lower volume if even the cheapest Bluetooth speakers from AliExpress can, absolutely despicable.

In near-field listening situations, such as a bedside speaker or even a desktop, 1% can indeed be too much. The problem is that when Sonos added the volume limit/scaling feature they didn’t increase the granularity. Set the limit to 10% and the volume slider to 9% and the resulting 0.9% is rounded down to 0%. 

The “answer” is insulting to the OP. Sonos really needs to address their volume setting issues. The sliders are horrible, especially on a phone.  If I’m trying to set the volume to less than 10%, in the process of lifting my finger, the setting can easily change from, say, 6% to 9%. I would suggest a “low volume” toggle. That way the volume control can be made much more precise for low volumes. On my Android phone, I have found that I can sometimes use the phone’s volume controls to move the Sonos sliders 1% at a time, which is helpful. It doesn’t seem to work on my iPad, though.  I have Sonos products throughout my home. I most often use it for background music. I rarely need concert-level volumes.  I don’t recall this being a problem in years past.

To adjust low volume, slide all the way to the left, then tap to the right of the slider to adjust by a single increment at a time.

You can reduce the sensitivity of the slider at low absolute volumes by using the ‘volume limit’ feature in room settings.

It’s just that, as noted, the lowest steps of the slider will then deliver silence...