It was narrated that 'Aishah said:

"I noticed that the Messenger of Allah was not there one night, and I thought that he had gone to one of his other wives, so I reached out for him, and found him bowing or prostrating, and saying: 'Subhanaka wa bi hamdika la ilaha illa anta (Glory and praise be to You, there is none worthy of worship but You).' I said: 'May my father and mother be sacrificed for you; you were doing one thing, and I was thinking of something else.'"

أَخْبَرَنِي إِبْرَاهِيمُ بْنُ الْحَسَنِ الْمِقْسَمِيُّ، عَنْ حَجَّاجٍ، عَنِ ابْنِ جُرَيْجٍ، عَنْ عَطَاءٍ، أَخْبَرَنِي ابْنُ أَبِي مُلَيْكَةَ، عَنْ عَائِشَةَ، قَالَتْ فَقَدْتُ رَسُولَ اللَّهِ ﷺ ذَاتَ لَيْلَةٍ فَظَنَنْتُ أَنَّهُ ذَهَبَ إِلَى بَعْضِ نِسَائِهِ فَتَجَسَّسْتُهُ فَإِذَا هُوَ رَاكِعٌ أَوْ سَاجِدٌ يَقُولُ " سُبْحَانَكَ وَبِحَمْدِكَ لاَ إِلَهَ إِلاَّ أَنْتَ " . فَقُلْتُ بِأَبِي وَأُمِّي إِنَّكَ لَفِي شَأْنٍ وَإِنِّي لَفِي شَأْنٍ آخَرَ .