Sahih Muslim Book 4, Hadith Number 1586.

Chapter : The virtue of Sunan prayers before and after the Fard Rak’ahs and their number.

‘Abdullah b. Shaqiq reported: I fell ill in Persia and therefore, prayed in a sitting posture, and I asked ‘Aisha about it and she said: The Messenger of Allah (may peace be upon him) prayed for a long time in the night sitting.