ANSWER:
ADKHAR BEFORE SLEEPING:
You should recite: Allahumma Bismika Amutu Wa Ahya once.
Ayat al kursi once.
SubhanAllah 33 times, Alhamdulillah 33 times, AllahuAkbar 34 times.
Surah Kafiroon once.
Surah Ikhlas 3 times, Surah Falak 3 times, Surah Nas 3 times.
Surah Mulk, Surah Sajdah once.
Last two ayahs of Surah Baqarah.
You will find these and other sunnah duas and adhkar for throughout the day and night in a small booklet called ‘Hisnul Muslim’, on English it’s called ‘Fortress Of The Muslim’