Brain Waves in Puberty

Not only are there changes to the body's maturation during puberty, there are also changes in the brain waves. They brain is still developing until late in the teen years usually, but a recent study showed that 9-11 year olds have an unchanged rate of Delta waves from the sleep and awake stage, but in the 12-14 year olds, there were at 25% decrease in Delta waves during sleep. This changes were related to age only, and were not significantly different in 12-14 year olds at different stages of sexual maturation, or size, or any other factors. -Oliver Hunt

http://science.monstersandcritics.com/news/article_1230406.php/Adolescent_brain_wave_changes_are_studied