As others have said, the A380 is very quiet and a lumbering plane. It feels like a big comfy sofa in the sky and it rarely gets bumpy.

Main deck is quieter than a B7x7 or A320

Upper Deck 2-4-2 config isn't good IMHO if you have a window set at they're set a little bit away from the window, so if you like to sleep against the window, then it is quiet difficult.

A777 in 3-4-3 config has less room but it easier for me to sleep!