What I mean is an option that would allow us to put to sleep chosen workspace so it could be awaken(all tabs would be loaded like they were for the first time) later simply by choosing certain workspace. It could be done manually or automatically if inactive by some setting like "sleep after X".

But why bother? Well, lots of opened tabs means lots of used resources. I would like to use certain workspaces only once a day/week without thinking about my precious resources and I guess I am not the only one who thinks like that.