Setting up a snooze wake-up

I think you mean naps? Yes, in the nap glance you can set a nap timer.

Indeed, there is such an option in the snooze widget. It's a pity that you can't add a keyboard shortcut to navigate quickly.

Thank you very much for your answer, you helped me a lot!

Well, if you want a hotkey, you can set a hotkey for "timers", and add a 20 minute timer there. The downside is that a normal timer doesn't activate sleep mode (and who knows, maybe the nap timer helps the watch to recognize the nap).

One thing I loved about my Pebble was that it had something similar, where i could set up a range of times that I would prefer to wake up at, and it would go off when I was at my lightest level of sleep, so not in a deep or REM sleep stage.