DU'A WHEN SOMEONE WAKES YOU AT NIGHT
Ubaidah bin As-Samit (RA) narrated that the prophet (SAW) said: "Whoever wakes up at night and says":
لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدَ، وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ. سُبْحَانَ اللهِ، وَالْحَمْدُ للهِ، ولَا إِلَهَ إِلَّا اللهُ، وَاللهُ أَكْبَرُ، وَلَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ العَلِيِّ الْعَظيِمِ.
la 'iilah 'illa allh wahdah la sharik lahu, lah almulk walah alhamda, wahu ealaa kull shay' qadirun. subhan allhi, walhamd llhi, wla 'iilah 'illa allhu, wallh 'akbaru, wala hawl wala quwwat 'illa biallh alaili aaziim.
There is no god but Allah alone, He has no partner, His is the kingdom and His is the praise, and He is capable of everything. Glory be to Almighty, and praise be to Allah, and there is no god but Allah, and Allah is great, and there is neither might nor power except with Allah, the Most High, the Great.
Then he says: "Allahummaghfir lii" ( O Allah, forgive me). Or Supplication Allah his supplication will be answered and it he perform ablution and offers prayers, his prayer will be accepted.
[Bukhari]