((لاَ إِلَهَ إِلاَّ اللَّهُ الْوَاحِدُ الْقَهّارُ، رَبُّ السَّمَوَاتِ وَالْأَرْضِ وَمَا بَيْنَهُمَا الْعَزيزُ الْغَفَّارُ)).
None has the right to be worshipped except Allah, The One, AL-Qahhar. Lord of the heavens and the Earth and all between them, The Exalted in Might, The Oft-Forgiving. (AL-Qahhar:The One Who has subdued all of creation and Whom all of creation are subservient to. All movements occur by His will.)
This is to be said if you turn over in bed during the night. Al-Hakim graded it authentic and Ath-Thahabi agreed 1/540. Also see An-Nasa'i, 'Amalul-Yawm wal-Laylah, and Ibn As-Sunni. See also Al-Albani, Sahihul-Jami' As-Saghir 4/ 213.