The Messenger of Allah ﷺ said, "My eyes sleep, but my heart does not sleep."
حدثنا يحيى بن سعيد عن ابن عجلان قال سمعت أبي
قال رسول الله ﷺ تنام عيني ولا ينام قلبي
Its isnad is sahih. Ajlan, the freed slave of Fatimah bint Utbah and father of Muhammad, his reliability was already established earlier at number 7358, and we add here that Ibn Saad gave his biography in Tabaqat 5/225. The hadith will come again as number 9655 with this same isnad.I did not find it anywhere else among the hadiths of Abu Hurairah. I do not know whether Hafiz Haythami simply forgot it and so did not mention it in Majma al-Zawaid, or whether its location was hidden from me.I can affirm, after tracking and investigation by myself and by my brother Ustaz Muhammad Fuad Abdul-Baqi, who perhaps tired himself searching for it as much as I did, or more, that none of the authors of the Six Books narrated it from the hadith of Abu Hurairah.Suyuti mentioned it in Jami Saghir at 2367, with the wording, "My eyes sleep but my heart does not sleep," attributing it to Ibn Saad from Hasan as a mursal narration. This is strange of him! Yes, Ibn Saad did narrate it at 1/1/113 from Hasan as mursal, but it is established with the wording he quoted from the hadith of Ibn Abbas as a connected narration, as already mentioned in the Musnad, number 1911. Its meaning is also established as sahih from the hadith of Ayesha, in the Sahihayn and elsewhere, with the wording, "O Ayesha, my eyes sleep but my heart does not sleep." See Bukhari 3/27, 4/220, 6/423, Muslim 1/205, Tirmidhi 1/331–332, and Nasai 1/248.Suyuti also mentioned this hadith of Ayesha in the additions to Jami Saghir. See Fath Kabir, pages 394–395, but he fell short in his referencing there as well, attributing it only to Bukhari and Nasai. See also, for similar meaning, numbers 2194, 2514, 3490, and 3502.