Anas (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) used to leave fasting in a certain month until we would think that he has not fasted at all that month; and he used to fast in another month so much that we would think he has not stopped fasting at all in that month. If one wished to see him praying at night, one could see him (in that state), and if one wished to see him sleeping at night, one could see him (in that state) too.

‘Ā’ishah (may Allah be pleased with her) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) used to strive to fast on Mondays and Thursdays.

‘Ā'ishah (may Allah be pleased with her) reported that the Prophet (may Allah's peace and blessings be upon him) came in while a woman was sitting with her. He said: "Who is she?" ‘Ā'ishah replied: "She is so-and-so," and told him about her (excessive) praying. He said disapprovingly: "Do (good) deeds according to your capacity, for by Allah, Allah never grows weary (of giving rewards) unless you grow weary (of doing good deeds), and the best deed in His sight is that which is done regularly.”

‘Awf ibn Mālik al-Ashja‘i (may Allah be pleased with him) reported: I stood in prayer one night with the Messenger of Allah (may Allah’s peace and blessings be upon him). He stood up and recited Sūrat al-Baqarah. Whenever he came across a verse mentioning mercy, he stopped and asked (Allah for mercy); and whenever he came across a verse mentioning punishment, he stopped and sought refuge (with Allah from it). Then he bowed and paused as long as he stood, and said while bowing: "Glory be to the Possessor of greatness, dominion, grandeur, and majesty." Then he prostrated himself and paused as long as he stood and said while prostrating the same thing he said while bowing. He then stood up and recited Sūrat Āl-‘Imrān, and then recited other Sūrahs, one after another.