My son turns 14 tomorrow and is tired ALL THE TIME. He's definitely in his growth spurt, because two months ago he was 1" shorter than me and now he's 1" taller than me, and he will be over 6' tall. Is this just the demands of a fast growing body and brain? He doesn't seem depressed, just tired. He's never been a hyper active kid, but he wakes up tired despite getting 9 hours of sleep, and comes home from school tired. He takes vitamins, including B vitamins, but sometimes I have to remind him.