Musnad Ahmad 1911

It was narrated from Ibn "Abbas: I stayed overnight with my maternal aunt Maimoonah. The Prophet (ﷺ) got up to pray at night. He did a light wudoo’, then he stood (to pray), and Ibn "Abbas did the same as he did, then he came and stood (to pray), and he (the Prophet (ﷺ)) moved him to make him stand on his right. Then he prayed with the Prophet (ﷺ), who then lay down until he breathed deeply. Then the mu’adhdhin came to him and he got up to pray and did not do wudoo’.