آداب النوم والاستيقاظ
‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported: ‘Umar ibn al-Khattāb (may Allah be pleased with him) said: "O Messenger of Allah, may anyone of us sleep while being ritually impure?" He said: "Yes, he may sleep if he makes ablution."  
عن عبد الله بنِ عمر -رضي الله عنهما- أن عمرَ بْن الخطاب -رضي الله عنه- قال: ((يا رسول الله، أّيَرقُدُ أَحَدُنا وهو جُنُب؟ قال: نعم، إِذَا تَوَضَّأ أَحَدُكُم فَليَرقُد)).

شرح الحديث :


‘Umar ibn al-Khattāb (may Allah be pleased with him) asked the Prophet (may Allah’s peace and blessings be upon him) about whether it is permissible for a man to sleep in a state of ritual impurity at the earlier part of the night, after having sexual intercourse with his wife, even if there is no ejaculation, or having a wet dream. The Prophet (may Allah’s peace and blessings be upon him) declared it permissible, provided that this major ritual impurity is lessened with ablution.  

ترجمة نص هذا الحديث متوفرة باللغات التالية