Sleepy

Lately I have been very sleepy during classes. It is not that I wasn’t sleepy before though. Anyway, even during my favourite lesson, which is Japanese Language, I almost fell asleep. I don’t know what I have done that made me this sleepy. Maybe it is caused by fatigue? Stress? Well, to be honest, I’m not the type to stay up late just to study. Unless if I had homework that needd to be handed in by the next day. I can't even remember how much sweets I have been eating during classes to keep me from falling asleep, but most of the time they don't work. I still feel sleepy and cannot concentrate properly. I am going ought to have diabetes if this still keeps going on. So, what is the cause of my sleepiness? How do I get rid of this problem?

Even now I'm trying to have a proper sleep schedule and my teacher also suggested that I take a supplement for my body. Keeping a healthy and energetic body takes a lot a work, right?