Im getting headaches always?

im always getting headaches my mom called a specialist to check the house for carbon monoxide nothing also ive done mris and ct scans and i have nothing then my mom came to the conclusion which sounded so stupid but you tell me if you belive it she says i get headaches because im up late using my computer and playing my new 3ds and playing my ps3 you tell me is she right also its not a bad headache as in i cant think right just a little minor bother than goes away so what do you think also could this be a hemorrhage i never hit my head.