Anas bin Malik was asked about the Prophet's fasting and he said: "He would fast during a month until we thought that he did not want to abstain from fasting during any of it. And, he would not fast during a month until we thought that he did not want to fast during any of it. (There was no time) that I wanted to see if he was performing Salat during the night, except that I would see him praying, nor to see him sleeping, except that I would see him sleeping."
Reference: Jami` at-Tirmidhi 769 In-book : Book 8, Hadith 88 English translation : Vol. 2, Book 3, Hadith 769
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