when the prophet (May peace be upon him) lay down on his bed (at night), he would say: O Allah! In Thy name I die and live. When he awoke, he said: praise be to Allah who has given us life after causing us to die and to whom we shall be resurrected.
Sunan Abi Dawud Book 43, Hadith 277
← Previous Hadith when you go to your bed while you are in the state of purification. The other said: Perform ablution like the ablution for prayer. He then transmitted the tradition to the effect as Mu’tamir transmitted.

Sunan Abi Dawud Book 43, Hadith 276 Next Hadith → when any of you goes to his bed, he should dust his bedding with the inner extremity of his lower garment, for he does not know what has come on it since he left it. He should then lie down on his right side and say: In Thy name, my mercy on it, but if Thou lettest it go, guard it with that which Thou guardest Thy upright servants.

Sunan Abi Dawud Book 43, Hadith 278