The prayer for the final night prayer was called one night when a man said, "Messenger of Allah, I have something to discuss with you." So he stood speaking with him privately until the people, or some of them, began to doze off. Then he prayed, and no mention was made of his renewing his ablution.
حدثنا عفان حدثنا حماد بن سلمة قال أخبرنا ثابت
أقيمت الصلاة للعشاء الآخرة ذات ليلة فقال رجل يا رسول الله لي حاجة فقام يناجيه حتى نعس القوم أو بعض القوم ثم صلى ولم يذكر وضوءا