Our Lord wonders at two men
73) Narrated Ibn Mas'ud : The Prophet said: Our Lord wonders at two men: One is he who got out of his bed and quitted from among his family and tribesmen to perform prayers. Our Lord says: 0 My angels! Look at this slave of Mine who got up from his bed and quitted from among his tribesmen to offer prayers desiring what is available with Me and fearing what is with Me. Second is he who fought in Allah's cause and got defeated along with his fellow fighters. But he knew what punishment he will suffer in case of fleeing from the battlefield and what reward he will get in returning to the battlefield. So he returned (and fought against Allah's enemies) until he was killed desiring what is with Me and awing from what is with Me. Allah j?Jf says to his angels (wonderingly): Look at My slave who returned (to the battlefield) hoping for what is with Me and fearing what is with Me until his blood was shed.
(This Haditli is good and reported by Ahmad, Abu Da'ud, Ibn Hibban and AI-Hakim).
Allah's wonder is meant for His admiration and appreciation of the fighters' premeditation and patience to die for the sake of Allah. Getting up at night and praying is not also an easy thing; only real devotees can do that, let alone those who leave the Dawn prayers and sleep.