No Suspend on Desktop Server

I have a desktop server running Debian Unstable in the house, and I occasionally reboot it without logging back into the local desktop session. If I don’t login, I’d later find the machine mysteriously inaccessible — asleep. It’s set to never sleep, but that’s when I’m logged in.

To disable sleep in the GDM3 Greeter, I edited the /etc/gdm3/greeter.dconf-defaults, found the "Automatic suspend"/[org/gnome/settings-daemon/plugins/power] section and followed the comments to add:

Now the machine will act a little more like it’s a server.