The Messenger of Allah ﷺ used to pray during the night, making the witr the last of his prayers.
حدثنا يحيى بن آدم قال حدثنا عمار بن رزيق عن أبي إسحاق عن الأسود
كان رسول الله ﷺ يصلي من الليل حتى يكون آخر صلاته الوتر
Its isnad is sahih. It has previously appeared at 24458. Abbad bin Zurayq is al-Dabbi, and he is trustworthy. His hadith appears in Muslim and the four Sunans.