Hadith 2630
Sayyida Aisha Siddiqa (may Allah be pleased with her) narrates: The Prophet Muhammad (peace be upon him) did not perform the night nawafil (voluntary prayers) sitting down, until when he became older, then he would recite (the Qur'an) while sitting, and when about thirty or forty verses remained in the recitation, he would stand up and recite them, then go into prostration.