Musnad Abu Ya'la al-Mawsili 150:414

'Amr ibn Husayn narrated to us, Ibn 'Ulaythah narrated to us, al-Awza'i narrated to me, from al-Zuhri, from 'Urwah, from 'Aishah, that the Prophet (peace and blessings of Allah be upon him) said: "Whoever sleeps after the 'Asr (afternoon) prayer and his intellect is snatched away, let him blame none but himself."