‘A’isha told how God’s Messenger said when he awoke during the night, “There is no god but Thee. Glory be to Thee, O God, and praise be to Thee. I ask for Thy forgiveness of my sin, and I ask for Thy mercy. O God, increase me in knowledge, and do not let my heart swerve after Thou hast guided me. Grant me mercy from Thyself. Thou art indeed the munificent One.” Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا اسْتَيْقَظَ مِنَ اللَّيْلِ قَالَ: «لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ أَسْتَغْفِرُكَ لِذَنْبِي وَأَسْأَلُكَ رَحْمَتَكَ اللَّهُمَّ زِدْنِي عِلْمًا وَلَا تُزِغْ قَلْبِي بَعْدَ إِذْ هَدَيْتَنِي وَهَبْ لِي مِنْ لَدُنْكَ رَحْمَةً إِنَّكَ أَنْتَ الْوَهَّابُ» . رَوَاهُ أَبُو دَاوُدَ
sunnah.com