‘Imran b. Hussain asked the prophet ﷺ about the prayer a man offers in sitting condition. He replied: his prayer in standing condition is better than his prayer in sitting condition, and his prayer in sitting condition is half the prayer he offers in standing condition, and his prayer in lying condition is half the prayer he offers in sitting condition. (Using translation from Abū Dāʾūd 951)
أَنَّهُ سَأَلَ رَسُولَ اللهِ ﷺ عَنْ صَلَاةِ الرَّجُلِ قَاعِدًا فَقَالَ مَنْ صَلَّى قَائِمًا فَهُوَ أَفْضَلُ وَصَلَاةُ الرَّجُلِ قَاعِدًا عَلَى النِّصْفِ مِنْ صَلَاتِهِ قَائِمًا وَصَلَاتُهُ نَائِمًا عَلَى النِّصْفِ مِنْ صَلَاتِهِ قَاعِدًا