Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:13705 – Hārūn b. Malūl > Abū ʿAbd al-Raḥman al-Muqriʾ > ʿAbd al-Raḥman b. Ziyād > ʿAbdullāh b. Yazīd > ʿAbdullāh b. ʿAmr

[Machine] "The Prophet ﷺ asked a man from the Ansar, 'What do you say when you sleep?' He replied, 'I say: O Allah, I have placed my side, so forgive me.' The Prophet ﷺ said, 'Allah has forgiven you.'"  

الطبراني:١٣٧٠٥ – حَدَّثَنَا هَارُونُ بْنُ مَلُولٍ قَالَ ثنا أَبُو عَبْدِ الرَّحْمَنِ الْمُقْرِئُ قَالَ ثنا عَبْدُ الرَّحْمَنِ بْنُ زِيَادٍ عَنْ عَبْدِ اللهِ بْنِ يَزِيدَ عَنْ عَبْدِ اللهِ بْنِ عَمْرٍو

أَنَّ النَّبِيَّ ﷺ قَالَ لِرَجُلٍ مِنَ الْأَنْصَارِ «مَا تَقُولُ عِنْدَ مَنَامِكَ؟» قَالَ أَقُولُ بِاسْمِكَ اللهُمَّ وَضَعْتُ جَنْبِي فَاغْفِرْ لِي قَالَ «غَفَرَ اللهُ لَكَ»  

See similar narrations below:

Collected by Suyūṭī
suyuti:423-50b – Lirajul Mn al-Nṣār Kayf > Ḥīn Turyd n Tanām > Aqūl Biāsmik Rbbiá And Ḍaʿt Janbá Fāghfir Liá
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السيوطي:٤٢٣-٥٠b –

"إِنَّ النَّبىَّ ﷺ قَالَ لِرَجُلٍ منَ الأنْصَارِ: كَيْفَ تَقُولُ حِينَ تُريدُ أنْ تَنَامَ؟ قَالَ: أَقُولُ: بِاسْمِكَ ربِّى وَضَعْتُ جَنْبى، فَاغْفِرْ لِى، قَالَ: قَدْ غُفِرَ لَكَ".  

[ش] ابن أبى شيبة وفيه الأفريقى ضعيف