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
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَقُتَيْبَةُ بْنُ سَعِيدٍ، جَمِيعًا عَنْ حَمَّادٍ، - قَالَ يَحْيَى أَخْبَرَنَا حَمَّادُ بْنُ زَيْدٍ، - عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي يَزِيدَ، قَالَ سَمِعْتُ ابْنَ عَبَّاسٍ، يَقُولُ بَعَثَنِي رَسُولُ اللَّهِ صلى الله عليه وسلم فِي الثَّقَلِ - أَوْ قَالَ فِي الضَّعَفَةِ - مِنْ جَمْعٍ بِلَيْلٍ .
Ibn 'Abbas reported: Allah's Messenger (ﷺ) sent me from Muzdalifa ahead (of the caravan) along with the luggage or with the weak ones during (the latter part of the) night.