And it’s crap across the OSes. On Linux laptops don’t wake up from sleep, on Windows they keep waking up when nobody asks for it.
In our home office room there’s three laptops. My private one running Fedora, my work PC that sadly runs Windows and my wife’s laptop also running Windows.
My work laptop and my wife’s laptop keep waking up wasting electricity, and my private laptop needs a hard reset to wake it up every second time.
That feature should be stupid simple, yet it doesn’t work across the board.
Rant over.
With OpenSUSE Leap sleep always worked for me, (even hibernate works) but if you had it as external monitor only then sometimes the screen power off would not come back on, and the laptop screen was told to stay off. I found myself using KDEconnect on my phone to try to cycle monitor power on/off command and sometimes it figured it out