Shaykh ʿAbd al-Ghanī ibn Ismāʿīl al-Nābulsī
al-Ḥabīb Muhammad ibn ʿAlawī al-ʿAydarūs
(Tr.) Talut ibn Sulaiman Dawood

This compilation of two treatises, al-Kashf wa al-Bayān fī mā Yataʿallaq bi al-Nisyān & ʿIlāj al-Nisyān, one from the classical era and one from the 20th century, contain both conceptual discussion and practical advice on how to address the universal issue of overcoming forgetfulness and strengthening memory.

It includes: 

Overview of the challenge of forgetfulness
The wisdom of Allah in making forgetfulness part of human nature 
Discussion of forgetfulness in the Qur’an, hadith, and in scholarly texts 
Quranic verses that can be recited to help overcome forgetfulness and strengthen memory 
Du’a and dhikr from the Sunnah to help address forgetfulness
Prescriptions from traditional spiritual medicine to help address the root causes of forgetfulness, with step by step instructions for their preparation and use
And more. 

Although focused on a very specific topic, the benefits of this text are numerous and comprehensive, since memory and cognitive retention affect so many aspects of our lives. Thus, even if one implements only a few of its recommendations, this is a book that is sure to prove useful and bring long term blessings to one's life.