Musannaf Ibn Abi Shayba 3:4241

Jarir ibn Abd al-Hamid narrated to us, from Mughira, from Salama ibn Yahya ibn Talha, from his paternal aunt, Umm Ishaq bint Talha, who said: Al-Hasan ibn Ali used to take his portion of the night prayer at the beginning of the night. And Al-Husayn used to take his portion at the end of the night.