وَقَالَ أَبُو يُوسُفَ وَمُحَمَّدٌ رَحِمَهُمَا اللَّهُ: لَا يَزِيدُ بِاللَّيْلِ عَلَى رَكْعَتَيْنِ بِتَسْلِيمَةٍ وَاحِدَةٍ.
Translation: Abu Yusuf and Muhammad said that nighttime voluntary prayer should not exceed two rakahs with one salam.
The two companions prefer nighttime prayer in pairs. One supporting report states: صَلَاةُ اللَّيْلِ مَثْنَى مَثْنَى
Translation: Night prayer is offered two by two.
They use this to prefer separate two-rakah units, while Abu Hanifa allows larger connected sets up to the stated maximum.