"Nelson Mandela had a restful day," President Jacob Zuma's office said in a statement, adding doctors treating him had reported "a further improvement in his condition".
The Government is satisfied that the doctors are providing the former President with the best medical care possible to enable his recovery and comfort, the statement said.
Zuma also thanked thousands of South Africans who prayed for Mandela at various Easter church services during the weekend.
Earlier this month, Mandela spent a night at a Pretoria hospital where he underwent a successful medical examination.
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Three months ago, he was admitted for 18 days for treatment of the lung infection and surgery to extract gallstones. It was his longest stint in hospital since his release from prison in 1990.
Mandela had a long history of lung problems, dating back to the time when he was a political prisoner on Robben Island during apartheid. While in jail he contracted tuberculosis.