Yahya related to me from Malik that he had heard that Said ibnal-Musayyab used to say, "Sleep is disapproved of before isha andconversation after it." (ES)
App reference (ES): Book 7, Hadith 6 (ES)
USC-MSA web (English) reference: Book 7, Hadith 6 (ES)
Arabic reference (ES): Book 7, Hadith 260 (ES)