Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: Sayyiduna Umar (may Allah be pleased with him) mentioned before the Prophet (peace and blessings be upon him) that he becomes in a state of janabah during the night, so the Prophet (peace and blessings be upon him) instructed him to perform wudu, wash his private parts, and then go to sleep.
Hadith Referenceصحیح ابن حبان / كتاب الطهارة / 1214
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح: ق - انظر ماقبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم.