Remembrance 4 from Chapter 62
What to say when waking up at night and wishing to sleep afterwards
Bismika-llāhumma Rabbī waḍa‘tu janbī, wa bika arfa‘uh, in amsakta nafsī fa-rḥamhā, wa in radadtahā fā-ḥfaẓhā bimā taḥfaẓu bihi ‘ibādika-ṣ-ṣāliḥīn.
We relate in the books of at-Tirmidhī, Ibn Mājah and Ibn as-Sunnī with an excellent isnād from Abū Hurayrah 
who reported that the Messenger of Allah 
said: “When any one of you retires to his bed, he should dust his bed with the corner of his waist-wrapper (izār), because he does not know what came [to it] after him. Then he should say: In Your name, my Lord, I lay down my side and by You I raise it up. If You take my soul then have mercy on it, and if You release it then protect it by that with which You protect Your righteous servants.” [5].According to at-Tirmidhī, this hadith is ḥasan. The linguists say that ṣanifat al-izār with kasrah on the letter nūn means the side of it on which there are no fringes. It also said that it means either side.