<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello doctor ... Im worried about myself ... im a 14 year old girl but recently i have noticed that no matter how much sleep i get i allways feel tired in schoool and i have fallen asleep in lessons i find it hard to focus in lessons and i dont know how to controll it. I get nose bleeds quite often at random times i have a bruise on my spine in the middle of my back that wont go and i have had it for 2 months now and i get painfull ankle and knee joints and head aces quite often and i just dont know what to do please help ???  <response>: Increase sleepiness in teenagers is very common, its related to the stresses about body changes and insecurity. But a few things should be done to exclude organic causes : you need to do a CBC complete blood counts to exclude anemia, and thyroid function test.regarding the bruises I recommend doing Pt, PTT test, along with the platelet count in the CBC, these pretty much role out bleeding disorders that might cause nose bleeds and back bruises. 