WHy do you get sleepy after eating sweets or simple carbs?

Can you answer Vena Cava’s question about Diabetes?:

THe sugar raises your blood sugars up, so you have hyperglycemia which should give your body ENERGY instead of making you tired.
SO why are you tired?
ALso, I read that illness is stressful for a diabetic and if also makes u hyperglycemic. So they should take insulin, but why should they also eat? It said in the book, if you are sick try to eat and take your insulin. That doesnt make sense if they’re hyperglycemic
please no ghetto s****

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