Muwatta Malik Book 7, Hadith 4
Yahya related to me from Malik from Ismail from Ibn Abi Hakim
that he had heard that the Messenger of Allah, may Allah bless him and
grant him peace, heard a woman praying at night. He said, "Who is
that?" and someone said to him,"It is al-Hawla bint Tuwayt, she does
not sleep in the night." The Messenger of Allah, may Allah bless him
and grant him peace, disapproved of that and his disapproval showed in
his face. Then he said, "Allah, the Blessed and Exalted, does not
become weary, but you become weary. Take on whatever is within your
capability."
Yahya related to me from Malik from Hisham ibn Urwa from his father from A'isha, the wife of the Prophet, may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, said, "If you are drowsy in prayer, sleep until sleep leaves you, because if you pray while you are drowsy, you do not know whether you may intend to ask for forgiveness but (in fact) ask for harm."
Yahya related to me from Malik from Zayd ibn Aslam from his father that Umar ibn al-Khattab used to pray as much as Allah willed in the night until at the end of the night he would wake his family for the prayer. He used to say to them, "The prayer, the prayer." Then he would recite the ayat, "Enjoin prayer on your family and be constant in it. We do not ask you for your provision. We provide for you. And the end result is for taqwa." (Sura 20 ayat 132)