Al-Miqdad ibn al-Aswad said, "The Prophet, may Allah bless him and grant him peace, used to come at night and would give the greeting in such a way that it would not awaken anyone asleep, but the person who was awake would hear it."  

عَنِ الْمِقْدَادِ بْنِ الأَسْوَدِ قَالَ كَانَ النَّبِيُّ ﷺ يَجِيءُ مِنَ اللَّيْلِ فَيُسَلِّمُ تَسْلِيمًا لاَ يُوقِظُ نَائِمًا وَيُسْمِعُ الْيَقْظَانَ