Francis, 88, will not appear in public on Sunday to lead his usual weekly prayer with pilgrims, the Vatican said on Saturday, because he has been told to rest.
The pontiff has been suffering from bronchitis for more than a week and was admitted to hospital on Friday morning.
People have been gathering under a famous statue of John Paul II outside the hospital to pray for the Pope since he was admitted.
ANSA news agency reported on Sunday the Pope had briefly watched some of the main evening news bulletin on Italian TV on Saturday night before having a restful night.
A Vatican statement released late on Saturday said the Pope had been "prescribed complete rest" to help his recovery.
His treatment on Saturday was "slightly modified based on further microbiological findings", the statement said.
"Today's laboratory tests showed an improvement in some values."
The Vatican has said the Pope would remain in hospital as long as necessary.
Francis, who has been pontiff since 2013, has had influenza and other health problems several times in the past two years.
As a young adult, he developed a case of pleurisy and had part of one of his lungs removed and has been prone to lung infections in recent times.
The Pope has been suffering from respiratory issues since mid-December.
He begged off reading statements at several public events in January and February, attending the occasions but asking aides to read his prepared remarks.
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