عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يُجْنِبُ ثُمَّ يَنَامُ وَلَا يَمَسُّ مَاءً حَتَّى يَقُومَ بَعْدَ ذَلِكَ فَيَغْتَسِلُ
It is narrated from Sayyida Aisha (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) would become junub, he would sleep without even touching water, and then when he woke up, he would perform ghusl.