It was narrated that Jabir bin 'Abdullah said:
"The Prophet was asked about whether a person who is sexually impure can sleep, or eat, or drink. He said: 'yes, if he does ablution as for the prayer.'" (IT)
English reference (IT): Vol. 1, Book 1, Hadith 592 (IT)
Arabic reference (IT): Book 1, Hadith 635 (IT)