The Messenger of Allah (ﷺ) used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting.
Sunan Abi Dawud Book 2, Hadith 566
← Previous Hadith when the prophet (ﷺ) prayed sitting, he recited the Quran in sitting condition. When the amount of his recitation remained about thirty or forty verses he stood up and recited them standing. He then bowed and prostrated and then did so in the second Rak’ah of the prayer.

Abu Dawud said: 'Alqamah b. Waqqas narrated this tradition on the authority of 'Aishah from the Prophet (ﷺ) to the same effect.

Sunan Abi Dawud Book 2, Hadith 565 Next Hadith → I asked ‘A’ishah whether the Messenger of Allah (ﷺ) recited a whole Surah (of the Quran) in one Rak’ah of the prayer. She replied : (He recited from among) the Mufassal surahs. I asked: Did he pray (at night) sitting? She replied : (he prayed sitting) when the people made him old.

Sunan Abi Dawud Book 2, Hadith 567