question #3 Sahih al-Bukhari 6314, Book 80, Hadith 11 : What is the significance of the Prophet (ﷺ) placing his hand under his cheek before sleeping?

When the Prophet (ﷺ) went to bed at night, he would put his hand under his cheek and then say,
“Allahumma bismika amutu wa ahya,” and when he got up, he would say, “Al-Hamdu lil-lahi al-ladhi
ahyana ba’da ma amatana, wa ilaihi an-nushur.”