Do you always feel tired, like all the time? Well, I'm been feeling very weak and tired lately. I know it's not lack of sleep because I sleep over 8 hours and even nap in the afternoon. I even tried exercising and I still feel tired. Even when I eat breakfast, I feel sleepy after 2 hours or so. I did a checkup the other day at a clinic. My pediatrician states that I'm perfectly healthy. I'm 17 btw and I know feeling tired all the time is not good, any suggestions?