It is narrated from Sayyiduna Zuhayr al-Anmari (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) lay down on his bed, he would say: 'Allahumma ighfir li dhanbi, wakhsa' shaytani, wa fukka rihani, wa thaqqil mizani, waj'alni fi al-mala'i al-a'la' (O Allah, forgive my sin, drive away my devil in disgrace, free my pledged soul (grant me freedom from Hell), make heavy my scale (of good deeds), and grant me a place in the gathering of the exalted angels). This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.