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." (PT)
App reference (PT): Book 7, Hadith 6 (PT)
USC-MSA web (English) reference: Book 7, Hadith 6 (PT)
Arabic reference (PT): Book 7, Hadith 260 (PT)