Cutting cafeine to much too early can cause a headache. This too will pass. Try a cup or tea of coffee. If that stops it, you'll have learned the cause.
Being a bit sleepy on fast days is common. As you've noticed, staying busy helps.
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LEARN ABOUT FASTING
We've got loads of info about intermittent fasting, written in a way which is easy to understand. Whether you're wondering about side effects or why the scales aren't budging, we've got all you need to know.