ذِكْرُ صَلَاةِ الْمُصْطَفَى ﷺ بِاللَّيْلِ قَاعِدًا
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. (Using translation from Abū Dāʾūd 955)
أَنَّهَا قَالَتْ «كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا فَإِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا وَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا»