Pope Francis, battling double pneumonia, had a quiet night in hospital and is resting, the Vatican said on Wednesday.

The pontiff "continues to be alert and well oriented" and has not had any further respiratory crises, the Vatican said.

While the Vatican has detailed laws and rituals to ensure the transfer of power when a pope dies or resigns, they do not apply if he is sick or even unconscious.

Faithful gathered at St. Peter's Square in the Vatican and outside Rome's Gemelli Hospital on Monday (February 24) as Pope Francis remains critically ill but alert, according to the Vatican. Could these jumping mice change how astronauts exercise?

Cardinal Michael Czerny says Pope Francis has meant a great deal to the Catholic church — and to the world — as he served with a view to the 'common good.' Czerny, a Canadian who was appointed to his current role by Francis,

Pope Francis was a frequent visitor to Rome long before he became pope. Now his favorite shops and artisans are pulling for him as he battles double pneumonia.

Catholics from across the world are praying for Pope Francis amid his health battle.

Prayers are pouring in from parishioners all across San Diego after Pope Francis was listed in critical condition.

Catholics in Buenos Aires attended Mass on Sunday to pray for Pope Francis' recovery. (Video by Cristian Kovadloff)

Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.