Sayyiduna ‘Ubada bin Samit (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: “Whoever wakes up at night and recites: «لَاإِلٰهَإِلَّااللّٰهُ ........... وَلَاحَوْلَوَلَاقُوَّةَإِلَّابِاللّٰهِ» There is no deity except Allah, He is alone, He has no partner, to Him belongs the dominion and to Him belongs all praise, and He is powerful over everything. Glory be to Him, there is no deity except Allah, and Allah is the Greatest, and there is no power to avoid sins nor strength to do good except with Allah’s help. Then says: ‘O Allah, forgive me,’ or he said, ‘makes any supplication, his supplication will be accepted. Then if he performs ablution and prays, his prayer will also be accepted.’”
Hadith Referenceسنن دارمي / من كتاب الاستئذان / 2722
From these hadiths, the virtue of reciting these supplications and remembrances upon waking from sleep or awakening at night is understood.
Ibn Battal has written in the context of this hadith that Allah Ta'ala has promised through the tongue of His Prophet that any Muslim who wakes up at night in such a way that words filled with faith and conviction in the oneness (tawhid) of Allah Ta'ala, submission and servitude before His greatness and sovereignty, acknowledgment of His blessings, gratitude and praise for Him, and glorification and sanctification of His pure essence flow from his tongue, then Allah Ta'ala accepts his supplication and his prayer is also accepted in the court of the Lord of Might. Therefore, whoever this hadith reaches should consider acting upon it as a great fortune, and should cultivate sincerity of intention in all deeds for his Lord, for the very first condition of acceptance is this sincerity.