It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Sawdah (may Allah be pleased with her) gifted her turn to Aishah (may Allah be pleased with her), so he (peace and blessings be upon him) used to allot to Aishah (may Allah be pleased with her) both her own turn and the turn of Sawdah (may Allah be pleased with her).
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20454