Chapter. Sleeping while sitting does not nullify Wudu´

 Anas bin Malik narrated: Once the Iqamah was pronounced and the Messenger of Allah salla alayhi wa sallam was having a private talk with a man, and did not start the prayer till the people dozed off. (And in the Hadith of Shu´bah: He continued a private talk with a man until the Companions dozed off, then he came and led them in prayer.)