Any change i have Diabetes ?

Ok i know i have to ask a doctor about this(i will on monday). With the last month i have been feeling tired ad my eyes kind of sore to keep up when it gets later into the evening like 8pm onwards i go to bed at 2.30am every night this has not effected me ever before i get 8 hours sleep at least. I don't have high blood pressure its normal as of 4 months ago and had blood test about year or so ago and it was fine. I am normal weight for 18 year old and i am not losing weight or gaining weight fast or anything ?