Download any sound metering app for you smartphone and do some measurements on a quiet day. Those apps simply use your phone's mic and display some kind of decibel gauge or frequency response graph. Measure yourself talking on a normal tone, or a normal conversation or for example the t.v. on news broadcast at your usual listening volume.
Then measure your instruments playing as you normally would (Both plugged and unplugged).
That readings will take out the guesswork. You can also use the meter while playing at night just to be extra sure.
Just remember to hold your phone at the same distance from any sound source you measure, say, a meter away from you, a meter away from your tv speaker, a meter away from your guitar, etc.
I seriously doubt an unplugged guitar or bass will be any louder than a normal conversation, a measurement will tell you for sure.
I'm no musician bu I do own an electro acoustic guitar with nylon strings. It cannot overpower a conversation unless playing really hard, and surely cannot be heard through my apartment outer walls (Inner walls are drywall)
In my apartment I have tested with my music player and at a level that would overpower normal conversation in the bedroom, is barely noticeable if I go to the hallway outside the apartment and close the door.
If by any chance you still think you may annoy your neighbor with your playing, there are several good DIY sound treatment How-to in youtube and other platforms. Many are oriented towards echo and reverb cancellation for better sound recording, bur the working principle (Absorbing sound energy) is also good for reducing the amount of sound that escapes a room. The cheapest one I've seen uses a lot of tightly packed towels mounted on wooden frames and covered with an aesthetically pleasing fabric.