It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The prayer of a woman that is most beloved to Allah is the one she offers in the darkest part of her house."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5362