The narration in Sunan At-Tirmidhi(#3570) that mentions about Ali (رضي الله عنه) that he came to the Prophet ﷺ and asked him a solution to his weak memory and the Prophet ﷺ asking him to pray Qiyam-ul-Layl with four Rakahs and specific Surahs (Suwar) in each Rakah consecutively, Ya-Seen, Ad-Dukhan, As-Sajdah and Al-Mulk and a Dua after the prayers, is a rejected and fabricated narration.
Shaikh Al-Albani Rahimahullah classified it as Munkar and Mawdu.
الألباني (١٤٢٠ هـ)، السلسلة الضعيفة ٣٣٧٤ • منكر
الألباني (١٤٢٠ هـ)، ضعيف الترغيب ٨٧٤ • موضوع
Imam ibn Katheer Rahimahullah mentioned that it has something fron Ghurabah (strangeness) and Nakarah (Some aspect of being a rejected report).
ابن كثير (٧٧٤ هـ)، فضائل القرآن ٢٩٠ • بين غرابته بل نكارته • أخرجه الترمذي (٣٥٧٠)، والحاكم (١١٩٠)، والبيهقي في «الدعوات الكبير» (٥٢٧) باختلاف يسير.
Imam ibn Al-Jouzi mentioned it in his book Al-Mawduaat (a book compiling fabricated narrations).
ابن الجوزي (٥٩٧ هـ)، موضوعات ابن الجوزي ٢/٤٦٠
Imam Ad-Dhahabi also classified it as fabricated.
الذهبي (٧٤٨ هـ)، سير أعلام النبلاء ٩/٢١٧ • موضوع
Read the lengthy report here:
Saheehus-Seerah 