My sister has an iron deficiency. She has these symptoms as well. She gets very dizzy and light headed really easily and she tends to sleep a lot. You should ask your mother to take you into your family doctor just to clear up any confusion. It could be a number of things. It could be your birth control for all you know. If you do have an iron deficiency, it is not a big deal. All you will have to do is take a daily iron supplement, just like a vitamin, or a liquid iron supplement. You should seek medical attention regardless. Im sure it's nothing. Hope I helped a bit! xx