Narrated Anas:

Once the Iqama was pronounced and the Prophet was talking to a man (in a low voice) in a corner of the mosque and he did not lead the prayer till (some of) the people had slept (dozed in a sitting posture) .

حَدَّثَنَا أَبُو مَعْمَرٍ عَبْدُ اللَّهِ بْنُ عَمْرٍو، قَالَ حَدَّثَنَا عَبْدُ الْوَارِثِ، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ صُهَيْبٍ، عَنْ أَنَسٍ، قَالَ أُقِيمَتِ الصَّلاَةُ وَالنَّبِيُّ ﷺ يُنَاجِي رَجُلاً فِي جَانِبِ الْمَسْجِدِ، فَمَا قَامَ إِلَى الصَّلاَةِ حَتَّى نَامَ الْقَوْمُ.