It is recommended to send the weak among women and others ahead from Al-Muzdalifah to Mina at the end of the night, before it gets crowded, but it is recommended for others to stay there until they have prayed Subh in Al-Muzdalifah
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، ح وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ، كِلاَهُمَا عَنْ سُفْيَانَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، بِهَذَا الإِسْنَادِ . نَحْوَهُ .
A hadith like this has been narrated by 'Abd al-Rahman b. al-Qasim with the same chain of transmitters.