Sayyidah Aishah (may Allah be pleased with her) said that when the Prophet (peace and blessings be upon him) had prayed at night, he would pray witr, then pray two rak'ahs; if I was awake he would talk with me, otherwise he would lie down until the mu'adhdhin came.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4891