Asalam Alaikum
Read after Shaikh Alhussary Almualim Surah Al-Asr till you memorize the surah, minimum with meaning surah Al-Fatiha, Al-Naas, surah Al-Falaq, and Aya Al-Kursi.
Recite the last 3 surahs before you go to bed 3 times with Aya Al-Kursi 1 time for example.