The Book of Worship
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Chapter VI: Secrets of Fasting
It has been reported that the Prophet sometimes continued to fast in such a way that the people thought that he won't break it and sometimes he continued to keep no fast till the people thought that he won't keep fast. He slept sometimes in such a way that the people thought that he won't rise from bed and sometimes he kept wakeful in such a way that the people thought that he won't sleep again.
Source: Imam Al-Ghazali, Ihya Ulum al-Din (Revival of the Islamic Sciences)