Invocation
Before sleeping
سُبْحَانَ اللَّهِ (ثلاثاً وثلاثين) وَالْحَمْدُ لِلَّهِ (ثلاثاً وثلاثين) وَاللَّهُ أَكْبَرُ (أربعاً وثلاثينَ)
Glory is to Allah (thirty-three times in Arabic), Praise is to Allah (thirty-three times), Allah is the Most Great (thirty-four times)
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 7/71, Muslim 4/2091.