Hanafi
The sources give no view for it here.
إحياء ليلة عاشوراء
هل يُستحب إحياء ليلة عاشوراء بالعبادة؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
إحياء ليلة عاشوراء مستحب عند بعض الحنابلة
مستحبThe texts
إِحْيَاءُ لَيْلَةِ عَاشُورَاءَ: ١٨ - ذَهَبَ بَعْضُ الْحَنَابِلَةِ إِلَى اسْتِحْبَابِ إِحْيَاءِ لَيْلَةِ عَاشُورَاءَ.
«الموسوعة الفقهية الكويتية» (Kuwait) entry «إحياء الليل» vol. 2 p. 237
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
مستحبIts place in the school’s books is not linked yet.
What is «in our words» is our standard wording; the books’ texts stay as they are.