Researchers in Australia have found that older male teens, who, played a video game before going to bed, had their sleep delayed just a few minutes.

The study involved 13 male students, ages 14-18 who usually took less than 15 minutes to fall asleep, Michael Gradisar, a senior lecturer in clinical child psychology at Flinders University in Adelaide, Australia, said.

It was also reported that the study subjects did not have excessive daytime sleepiness and had no identifiable sleep disorders.

During the 50-minute experiment the teens played the Sony PlayStation 3 video game "Call of Duty 4: Modern Warfare." On a different night, the same study participants spent an equal amount of time watching the 2006 documentary "March of the Penguins."

Gradisar said in a statement, "We purposefully chose a very tranquil movie to contrast against the very stimulating effect of playing a violent video game in the hope of producing the greatest effect on sleep."

It was further found by the study that it took a median of 7.5 minutes for the teens who played the video games to fall asleep, while it took about 3 minutes for the teens to fall asleep after watching the documentary. (With Inputs from Agencies)