"The Messenger of Allah would become sexually impure and then sleep without water until he got up later on and taken a bath."  

كَانَ رَسُولُ اللَّهِ ﷺ يُجْنِبُ ثُمَّ يَنَامُ وَلاَ يَمَسُّ مَاءً حَتَّى يَقُومَ بَعْدَ ذَلِكَ فَيَغْتَسِلَ  

"The Messenger of Allah, if he needed any of his wives, would satisfy his needs then he would sleep as he was, without touching water."  

إِنَّ رَسُولَ اللَّهِ ﷺ إِنْ كَانَتْ لَهُ إِلَى أَهْلِهِ حَاجَةٌ قَضَاهَا ثُمَّ يَنَامُ كَهَيْئَتِهِ لاَ يَمَسُّ مَاءً  

The Messenger of Allah would become sexually impure then sleep as he was, without touching water. (Da'if)Sufyan said: "I mentioned this Hadith one day, and Isma'il said to me: 'O young man, you should support this Hadith with something else.'"  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُجْنِبُ ثُمَّ يَنَامُ كَهَيْئَتِهِ لاَ يَمَسُّ مَاءً قَالَ سُفْيَانُ فَذَكَرْتُ الْحَدِيثَ يَوْمًا فَقَالَ لِي إِسْمَاعِيلُ يَا فَتًى يُشَدُّ هَذَا الْحَدِيثُ بِشَىْءٍ