Du'a of gratitude before sleeping

الْحَمْدُ للهِ الَّذِي أَطْعَمَنَا وَسَقَانَا، وَكَفَانَا، وَآوَانَا، فَكَمْ مِمَّنْ لَا كَافِيَ لَهُ وَلَا مُؤْوِيَ

Alhamdu lillahil-ladhi at'amana wa saqana, wa kafana, wa awana, fakam mimman la kafiya lahu wa la mu'wi

Praise is to Allah Who has provided us with food and with drink, sufficed us and gave us an abode, for how many are there with no provision and no home.

Ṣaḥīḥ Muslim 2715 (said on going to bed)