Ibn Abbas (may Allah be pleased with them both) says: I spent the night at the house of my maternal aunt Maymunah (may Allah be pleased with her). The Prophet (peace and blessings be upon him) was praying at night. I stood on his (peace and blessings be upon him) left so that I could pray along with his (peace and blessings be upon him) prayer. He (peace and blessings be upon him) took me by my hair, or by my head, and placed me on his right side.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5152