Sunan Abi Dawud 5045
سنن أبي داود#5045SahihNarrated Hafsah, Ummul Mu'minin: When the Messenger of Allah (ﷺ) wanted to go to sleep, he put his right hand under his cheek and would then say three times: O Allah, guard me from Thy punishment on the day when Thou raisest up Thy servants
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiIsnaad Hasan
In-book reference: 43:273