Sugar=energy

So as many of u know sugar gives us energy. The question is what type is the right type and is the quick fix the way to go, or should I be going for protein which will give me less energy but last longer and be better for me?!? I think I know the answer.... But after 11 hrs of studying/schooling and still having loads to read I want sugar.....ahhhhh I'll go make a cup of tea and munch on an apple. Back to reading and studying...