question #3 Sahih Muslim 731c, Book 6, Hadith 136 : What can be learned about the Prophet’s (ﷺ) dedication to prayer from his practice during Tahajjud?

The Messenger of Allah (ﷺ) used to recite in sitting position (while observing the Tahajjud prayer) and when he intended to bow, he would stand up and recite (for the duration in which) a man (ordinarily) recites forty verses.