Pope Francis rested overnight in the hospital, the Vatican said earlier Sunday, adding that his night "passed peacefully."

Pope Francis, battling double pneumonia, remains in a critical condition for a second day running and his prognosis is still guarded, the Vatican said on Sunday. The pope, 88, was admitted to Rome's Gemelli hospital on February 14 after experiencing difficulty breathing for several days and subsequently had pneumonia diagnosed in both lungs.

Pope Francis appears to have an "early, mild renal insufficiency" as he remains hospitalized in critical condition, the Holy See Press Office said in Sunday evening update.