I asked Ibn Umar a similar question, and he added that one should perform the witr with a single rakah at the end of the night. In it he said, "Easy, easy! You are quite a hefty fellow."
وحدثنا ابن المثنى وابن بشار قالا حدثنا محمد بن جعفر حدثنا شعبة
سألت ابن عمر بمثله وزاد ويوتر بركعة من آخر الليل وفيه فقال به به إنك لضخم