It is narrated from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) that a Yemeni woman was brought to Sayyiduna Umar (may Allah be pleased with him). They said: She is an adulteress. She said: I was asleep; when I woke up, a man had done this deed with me with the swiftness of a shooting flame. Sayyiduna Umar (may Allah be pleased with him) said: Yemeni women are very heavy sleepers. (So) he let her go and also gave her some provision.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17047