The prayer was called to begin while the Messenger of Allah ﷺ was conversing privately with a man, until some of the people dozed off or nearly dozed off.
Ahmad 12881
Sahih
حدثنا يحيى عن حميد
عن أنس قال
أقيمت الصلاة ورسول الله ﷺ نجي لرجل حتى نعس أو كاد ينعس بعض القوم