Frequent conversation:
"oh you have a smartwatch"
"no it's dumb in all the right ways, which is the point"
Notably I have notifications but can't act on them, which prevents me from picking up the phone just to check notifications and then be drawn into doing actions. YMMV.
I've tried that, but found them to be too easy to sleep through unless my watch wrist is very close to my head (without a pillow between it and my ear). The sound isn't particularly loud and the vibration is similarly shallow. Useful for reminder alarms when I'm awake though.
My current success is using the Amazon branded wiretap for alarms. Interacting with the dumb cloth-eared irritation sometimes annoys me into being awake rather than hitting the virtual snooze yet again, and it doesn't have the doom-scroll potential of my phone.
To use them for alarms I just have to say “Computer, set an alarm for 8 in the morning” repeatedly until the damned things understand (I swear they understand a snarky tone far better than when I speak more neutrally (except when Lt Cmdr Data is on TV, they listen to him first time every time!)).