How to offer Salam to people when some of them are asleep while others are awake

How to offer Salam to people when some of them are asleep while others are awake 

Al-Miqdad (May Allah be pleased with him) reported in course of a long Hadith: We used to reserve for the Prophet (sallallaahu ’alayhi 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 (sallallaahu ’alayhi wa sallam) came and offered greetings as usual. [Muslim]

Commentary:  Herein, we are told 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. 

Ref.: Imam Al-Nawawi's Riyad-us-Saliheen # 854. 

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The Prophet (sal Allahu alaihi wa sallam) said, 
"If the companion of the Qur'an persists in reciting it by night and by day, he will remember it, 
but if he does not do that he will forget it." 
[Sahih Muslim]