'Aaishah (radhi-yAllaahu 'Anhaa) narrated that the Messenger of Allaah (sal-Allaahu 'alayhe wa sallam) used to say at night if he turned during sleep:
لَا إِلٰهَ إِلَّا اللّٰهُ الْوَاحِدُ الْقَهَّارُ، رَبُّ السَّمَاوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا الْعَزِيْزُ الْغَفَّارُ
There is none worthy of worship but Allah, the One, the Victorious, Lord of the heavens and the earth and all that is between them, the All-Mighty, the All-Forgiving.
Laa 'ilaaha 'illallaahul-Waahidul-Qahhaaru, Rabbus-samaawaati wal'ardhi wa maa baynahumal-'Azeezul-Ghaffaaru.