Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Any Muslim who wakes from his sleep at night and recites:
'La ilaha illallah, wallahu akbar, wa subhan Allah, wal-hamdu lillahi rabbil-'alamin. Allahumma ighfir li' (There is no god but Allah; Allah is the Greatest; Allah is free from every imperfection; all praise belongs to Allah, the Lord of all the worlds. O Allah, forgive me.) (The Prophet (peace and blessings be upon him) said:) that person will be forgiven; and if he resolves, gets up, performs ablution (wudu) and supplicates to Allah Almighty, his supplication will be answered."
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains Aban bin Abi Ayyash, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأذكار / 17061