Abdullah bin Abbas reported,

After the Prophet ﷺ prayed Fajr, he lay down until he breathed deeply in sleep. We used to say to Amr, "The Messenger of Allah ﷺ said, 'My eyes sleep but my heart does not sleep.'"

Azami 688

Sahih

عن ابن عباس، أنه قال

لما صلى النبي ﷺ الفجر اضطجع حتى نفخ فكنا نقول لعمرو: إن رسول الله ﷺ قال: تنام عيناي ولا ينام قلبي.

الأعظمي 688صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Faith
Chapter
Belief in the messengers, peace and blessings be upon them
Section
Among the special qualities of the prophets is that their eyes sleep but their hearts do not sleep
Numbering
Jami al-Kamil 688 (2nd edition)
Azami 688