Fortress of the Muslim (Hisn al-Muslim)
حصن المسلم
(28) Chapter: Before sleeping
(28) أذكار النوم
Hisn al-Muslim 106 
Subḥānallāh, Wa ‘l-ḥamdu lillāh, Wallāhu Akbar. Glory is to Allah (thirty-three times in Arabic), Praise is to Allah (thirty-three times), Allah is the Most Great (thirty-four times) Reference: Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 7/71, Muslim 4/2091.
سُبْحَانَ اللَّهِ (ثلاثاً وثلاثين)
وَالْحَمْدُ لِلَّهِ (ثلاثاً وثلاثين)
وَاللَّهُ أَكْبَرُ (أربعاً وثلاثينَ)
Reference : Hisn al-Muslim 106