Mishkat al-Masabih 2400, 2401

Hudhayfah reported that when the Prophet ﷺ intended to sleep, he would place his hand beneath his head and say, “O Allah, protect me from Your punishment on the Day You gather—or raise—Your servants.” Reported by al-Tirmidhi; Ahmad also reported it from al-Bara’. Both reports were not studied by al-Albani.