The pope slept and is resting," the Vatican statement said. The Vatican had said late Sunday his condition remains critical and he is suffering from mild kidney impairment, although he was able to attend Mass at Gemelli hospital Sunday morning with medical staff.

Pope Francis has been in hospital for 11 days, with recent blood tests show early, mild kidney failure after he experienced a respiratory crisis.

The pope has spent nine nights at Rome's Gemelli Hospital, receiving treatment for pneumonia and other health complications. He is "alert and well-oriented" and attended Mass on the 10th floor of the hospital today, the Holy See Press Office said.