Worse - imagine needing a wee in the night after a skinful and you are in the bed on the mezzanine floor right at the top. You have to not fall over the inadequate bannister into the living room/office space, then not fall over the more substantial bannister, then down another flight of stairs (at least). Then back up again. Some kind of guzunder would be in order but try not to spill it when you need to empty it.
Worse - imagine needing a wee in the night after a skinful and you are in the bed on the mezzanine floor right at the top. You have to not fall over the inadequate bannister into the living room/office space, then not fall over the more substantial bannister, then down another flight of stairs (at least). Then back up again. Some kind of guzunder would be in order but try not to spill it when you need to empty it.
Might be more practical to just have a piss bucket on that mezzanine, assuming you can even successfully get up there in first place.