Sahih Muslim
The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness (Kitab Al-Dhikr)
Book Number: 035 / Hadith Number: 6546
Al-Bara' b. 'Azib reported that Allah's Messenger (in may peace be upon him) commanded a person (in these words): When you go to bed during night, you should say:" O Allah, I surrender myself to Thee and entrust my affair to Thee, with hope in Thee and fear of Thee. There is no resort and no deliverer (from hardship but Thou). I affirm my faith in the Book which Thou revealed and in the Messengers whom Thou sent." If you die in this state you would die on Fitra, and Ibn Bashshdr did not make a mention of" night" in this hadith.