> First: is it possible to sleep or suspend from the CLI? No GUI installed
> at all, nor is one wanted. I'm not looking for data to be written to the
> HDD, a la "hibernation".
As already suggested there is pm-hibernate and pm-suspend. For an
alternative see s2disk and s2ram.
> Second: if so, can I alternatively tell it to sleep after an absence of
> activity from my LAN, with WOMP/WOL? (Wake-on-Magic-Packet)
I use the 'sleepd' package to suspend after an idle period when on
And of course WOL is a hardware and BIOS feature of your machine.