من لا يحضره الفقيه, volume 1, page 477

Hadith.1375 - Ubayd ibn Zurarah narrated from Imam Jafar ibn Muhammad Al-Sadiq (as) that He said: "The Messenger of Allah (sw), after performing the Isha prayer, would retire to his bed and would not perform any additional prayer until midnight."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1377 - Umar ibn Hanzalah said to Imam Jafar ibn Muhammad Al-Sadiq (as): "I have spent eighteen nights intending to rise (for the night prayer) but did not get up. Should I then pray at the beginning of the night?" He (as) replied: "No, make it up during the day, for I dislike it becoming a habitual practice."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1378 - It is reported from Mu'awiyah ibn Wahb that He said: "I said to him (Abu Abdullah (as)): 'One of your followers, who is among your righteous adherents, complained to me about the difficulty he experiences with sleep. He said to me: ‘I wish to rise for the night prayer (salat al-layl), but sleep overcomes me until I wake up in the morning. Sometimes I make up my prayer continuously for a month or two and endure the difficulty.’ Imam (as) said: 'By Allah (swt), it is a source of delight, by Allah (swt), it is a source of delight!' But he did not permit performing the Witr (single unit of the night prayer) at the beginning of the night. Imam (as) said: 'Making it up during the day is better.'"

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.