How to offer Salam to people when some are asleep while others are awake
Al-Miqdad (radi Allahu anhu) reported in course of a long Hadith: “We used to reserve for the Prophet (sal Allahu alaihi wa sallam) his share of the milk, and he would come at night and offer greetings in such a manner as did not disturb those asleep and was heard only by those who were awake. In fact, the Prophet (sal Allahu alaihi wa sallam) came and offered greetings as usual.”
We benefit from the above Hadith how to offer Salam to people when some of them are asleep while others are awake.
Our voice should be so low so as not to disturb those who are asleep and to give a chance to those who are awake to respond to it.
And Allah knows best!