The Prophet (pbuh) said "Whoever gets up at night and recites the following dua, Allah will respond to him."

La’ilaha illallahu wah’dhahu laa shareekalahu, lahul mulqu walahul hamdhu, wahuwa ala kulli shai’ in kadheer. Alhamthu lillahi wasubuhanallahi wala ilaaha illallahu wallahu akbar, wala hawla wala quvvatha illa billahi, Allahummagh firli.

لَا إِلهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيْكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيْرٌ الْحَمْدُ للهِ وَسُبْحَانَ اللهِ وَلَا إِلهَ إِلَّا اللهُ وَاللهُ أَكْبَر وَلَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ اَللّهُمَّ اغْفِرْ لِيْ

Meaning:
None has the right to be worshipped but Allah. He is the Only One and has no partners. For Him is the Kingdom and all the praises are due for Him. He is Omnipotent. All the praises are for Allah. All the glories are for Allah. And none has the right to be worshipped but Allah, And Allah is Great And there is neither Might nor Power Except with Allah. O Allah! Forgive me.

(Book: Bukhari 1154)