Do not give up prayer at night, for the Messenger of Allah ﷺ would not leave it. Whenever he fell ill or lethargic, he would offer it sitting. (Using translation from Abū Dāʾūd 1307)
لِي عَائِشَةُ لَا تَدَعْ قِيَامَ اللَّيْلِ «فَإِنَّ رَسُولَ اللَّهِ ﷺ كَانَ لَا يَذَرُهُ وَكَانَ إِذَا مَرِضَ أَوْ كَسِلَ صَلَّى قَاعِدًا»