very tired from carbs if

So I'm doing if, eating 4hrs 20hrs fast. I feel great and Ive been losing fat while maintaining muscle. My problem is the carbs. So after my 20hr fast I lift weights and then post workout I eat 300 calories of gummy bears and milk with protein powder. Those are the only carbs I'm having for the rest of the day. Rest if the day is going to be bacon for fats and very lean protein such as tuna and greek yogurt. Now everything makes me feel great except for the carbs. They make me wanna go to sleep, I feel so sleepy and tired for the next hour or so but I can feel my muscles filling out each time I eat the carbs. Is there a way to eliminate the tired feeling. I dont have it when I eat regular 6 or 7 meals a day, just when I do if. When I was a kid I literally did if, I ate like 4 5 burgers at once and then I wouldn't eat for the rest of the day. If is amazing tbh

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