Dua when turning over during sleep
لَا إِلَهَ إِلَّا اللهُ الْوَاحِدُ الْقَهَّارُ ، رَبُّ السَّمَوَاتِ وَالأَرْضِ وَمَا بَيْنَهُمَا ، العَزِيزُ الْغَفَّارُ
Aisha narrated that the Messenger of Allah (peace and blessings of Allah be upon him) used to say at night if he turned during sleep:
None has the right to be worshipped except Allah, The One, The Subjugator. Lord of the heavens and the Earth and all between them, The Exalted in Might, The Oft-Forgiving.
Note: The Subjugator; Al-Qahhar means the One Who has subdued all of creation and Whom all of creation are subservient to. All movements occur by His will.
laa ilaaha ill-allaahul-waaḥidul-qahhaar, rabbus-samaawaati wal-arḍi wa maa baynahumal-‛azeezul-ghaffaar
Sources: Al-Hakim 1/540 and he declared it authentic, Ath-Thahabi agreed, An-Nasa'i in Amal Al-Yawm wa Al-Laylah and Ibn As-Sunni, see Sahih Al-Jami’ 4/213.