Washington, Aug. 17 (ANI): Actor Matt Damon's looks of a tired man on the run in 'The Bourne Ultimatum' border on the reality, thanks to his little daughter Isabella who kept him awake at night.

The actor's wife Luciana gave birth to daughter Isabella in June 2006, just before he began filming the sequel.

Since the baby girl did not let Damon have proper nap at night, he looked very exhausted during the shooting of the movie.

"I look so exhausted... Even if I tried to have a methodical sleep-deprivation look in the film, it wouldn't be as authentic as me being up all night with a crying baby at home," Contactmusic quoted him as saying.

Damon says that his acting abilities are improving due to sleepless nights he spends with 14-month-old daughter.

"I don't get very much sleep. I come on set and I am looking exhausted, but it is great because it gives me a bit of edge. My daughter makes me a better actor," he said. (ANI)