Why do I feel sleepy, drowsiness, light headed when

Patient : Why do I feel sleepy, drowsiness, light headed when I first wake up in a dry-fasting day? However, from my experience, if I wake up when I haven't eaten for 12 hours (for example, if I eat 7pm and wake up at 7am), I don't feel this drowsiness. whats the reason for that? Also, if I reach 24hours of fasting I get tired and/or hungry for an hour or two and then it becomes neutral for me. Are there any scientific explanations for this? I have read a lot but I would like to know the opinion of a specialist. I am 20 years old, active (regular exercise), weighs 60kgs (10-12% fat), very healthy, and regularly fast.
Symptoms:  Lightheadedness, drowsiness, fatigue, low blood pressure.
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