What I do if I’m in a sleeper is this:
I leave my bag in the luggage rack on the lower level. When I go to get changed or take a shower, I grab the necessary clothes for my bag (which is right next to the shower/rest rooms), take my shower and/or change, put my dirty clothes back in my bag and put it back on the rack.
This way, I do not have to drag my bag up the stairs. And as an added bonus, I can see if the shower is being used - and do not have to go back to my room and come back and then possibly have to do the same again. In all my travels, most times the shower is empty. The times it was used, the longest line was 1 - and the wait was under 5 minutes. I just waited in the hall and looked out the door window.