What to say before Sleeping

"If one of you rises from his bed and then returns to it he should dust it with the edge of his garment three times for he does not know what has occurred in his absence and when he lies down he should say:

“With Your Name my Lord, I lay myself down; and with Your Name I rise. And if my soul You take, have mercy on it, and if You send it back protect it as You protect your righteous slaves.””

[Narrated by  Al-Bukhari 11/126 and Muslim 4/2084]