"Why do you sleep on the ground?"

Translation: Dlaczego śpisz na ziemi?

[EvaKlingvall]

Isn't śpisz second person singular and should therefore also be acceoted?

[VarHyid]

That's correct, "you" can refer to singular or plural. A mod will correct this when they see it :)

[Jellei]

Accepted now.

[Ostbrot]

Should "Dlaczego śpisz na podłodze?" also work?