Women, the elderly, children, sick حجاج, and those who are weak or have difficulty with crowds are permitted to leave مزدلفہ after midnight (or after the moon sets) according to the consensus of scholars from all four schools. This is a confirmed Sunnah concession granted by نبی کریم (صلی اللہ علیہ وسلم) himself. He sent the weak members of his family, including his wife Sawdah and others, ahead from مزدلفہ to منیٰ during the latter part of the night to avoid the rush of the main body of حجاج departing at dawn.
Sheikh Ibn Baz explained that the concession is available to all who have a genuine reason for early departure, including women who want to avoid the extreme crowding, elderly حجاج, those with small children, and the sick. These حجاج may proceed directly to منیٰ and stone Jamrat al-Aqabah before dawn, which is permissible for them based on this concession. Strong, able-bodied men should remain at مزدلفہ until after Fajr نماز, following نبی کریم's own practice.
Sheikh Ibn Uthaymeen specified that the earliest permissible time for departure is the latter half of the night (after midnight), based on the narration that نبی کریم sent them ahead 'at the end of the night' and the moon setting. He cautioned against departing too early — shortly after Maghrib and Isha نمازs — as this would mean the حاجی barely stayed at مزدلفہ at all. Those who take this concession should still pray Maghrib and Isha at مزدلفہ before departing.