Automatic suspend-to-ram solution for Workstations

[Felix Natter <fnatter@gmx.net>]

Dear Debian users,

I am looking for an automatic suspend-to-ram (I know "sudo systemctl
suspend" ;-)) solution for workstations: I would like the system to
suspend if and only if:

- there is no gui interaction from any user (especially with VNC
  sessions) AND
  
- there is no significant load during the last hour (in order to account
  for backup jobs)

I am using the mate desktop, if that makes any difference.
Of course the desktop must be locked before suspension.

Maybe systemd can support this in coop with the DE?

I think Windows can do it, but Windows does not allow multiple users
logged in at the same time, so it is an easier task.

Am I asking too much? 

Many Thanks in Advance!
Felix
-- 
Felix Natter