The best prayer after the fard
أَفْضَلُ الصَّلَاةِ بَعْدَ الْفَرِيضَةِ صَلَاةُ اللَّيْلِ
Afdalu-s-salati ba'da-l-faridati salatu-l-layl.
"The best prayer after the obligatory is the night prayer."
Narrated by Abu Hurayrah. Sahih Muslim 1163
A short reflection
When the house is quiet, two rak'ahs are disproportionately heavy. Tahajjud is where the saints got made.