You must have read it in the Hadith where the Noble Prophet, Sallallahu alaihi Wasallam, said:-- "My eyes sleep, but my heart never sleeps."
His heart never sleeps! His heart is always connected to his Lord.... he is always in ascension. None can know the level attained in Ascension. Even Jibreel, alaihis-Salaam, was not able to know it, because he said [on the night of the 'Isra wal Mi'eraj] " I cannot move beyond my level", when the Prophet, Sallallahu alaihi Wasallam, asked him to continue with him. "If I go further, I will be burnt", Jibreel said.
Sufi Masters say that Jibreel, alaihis-Salaam, should have moved forward with the Prophet, Sallallahu alaihi Wasallam, even if he was going to be burnt. As the Prophet said to Jibreel, "I am going to move higher even if I am going to be burnt." He was ready to sacrifice himself to obtain that Light for his Community (Ummah), saying: ' have no concern for myself'....therefore he moved forward, constantly progressing, traveling to that level, closer and closer to his Lord...Sallallahu alaihi Wasallam.