The Late-Night Supererogatory Prayers & the Fasting of Ahl-ul-Bayt (A.S)
A'isha: The Holy Prophet (PBUH) would sleep early at night and stayed up all through its later parts [until dawn].
Abd Allah ibn Abbas: One night I stayed with the Holy Prophet (PBUH).Then, when he woke up, he brought his water container, took his tooth brush and brushed his teeth and recited the verse: Behold! In the creation of the heavens and the earth, and the alteration of night and day there are indeed signs for men of understanding... almost up to the end of the Surah. Then he performed his ablution and went to his place of prayer, performed two rakah of prayers, and then returned to his bed resting as much as Allah ordained, then he woke up, repeated the same, then he went back to sleep, again woke up, did the same, went back to sleep, woke up followed the same procedure again, each time brushing his teeth and saying two rakas of prayers; and [at the final time] he performed the Witr.
Imam Ali (A.S): Since I heard the Holy Prophet (PBUH) say the late-night prayer is light, I never quit it. Ibn al-Kuwwa, asked: Even at the night of Harir? The Imam replied: Even at the night of Harir.
Saduq in al-Fagih: Ali ibn al-Hussein (A.S), the master of the worshippers would say, al-afw, al-afw (forgiveness) three hundred times during the Witr prayer at dawn.
Ibrahim Ibn al-Abbas: Imam al-Reza (A.S) during night would sleep little and stay up long.
It is related that Imam al-Hadi (A.S) would sit towards the qiblah at night and would rest very little, there was a woolen clock on him and a straw mat under him as his prayer rug.
The Fasting of Ahl-ul-Bayt (A.S)
Abu Salama: I asked A'isha: How was the Holy Prophet (PBUH) fasting? She answered: He was fasting so frequently that we thought he would never quit fasting, and would not fast for such a long time that we thought he would never fast again; I did not see him fast more than he fasted in the month of Shaban. He would fast the whole month of Shaban except a few days, or rather he would fast the whole month.
Imam Sadiq (A.S): Amir al-Mu'minin (A.S) would come home and say: Is there any food at home, or shall I fast? If something was found with them, it was brought to the Imam (A.S), otherwise, he would fast.
Imam Sadiq (A.S): On the day he fasted, Ali ibn al-Hussein (A.S) would have a sheep slaughtered, butchered and cooked. When the time for iftar (breaking the fast) arrived, he would inspect the post so as to have the aroma of the prepared broth smelled. Then he would order the food to be served in the bowls and handed over to such and such and such families. After that munificence some bread and dates were brought in and the Imam (A.S) would break his fast with them.
Ibrahim ibn al-Abbas: Imam Reza (A.S) would fast a lot and would not give up the three-days-a-month fast, about which he would say: This is the perpetual fasting (Sawm al-Dahr)
Taken from: Ahl-ul-Bayt (A.S.) in the Holy Qur'an and Hadith By Ayatullah Muhammadi Rayshahri
Other links:
The Ahl-ul-Bayt's (A.S) Assiduity in Worship (Part1)
