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headaches
This is probably a result withdrawl from sugar(which I'm sure you know...!) but could also be do to reduced carb intake if you were previously consuming a lot and have now cut it out. Even though I like the LCHF diet I often find that if I drastically cut my carb intake I often have trouble sleeping. Something carb heavy (but no too sugary) like sweet potatoes for an evening meal might help. Also up your salt intake a bit for the first few days can help.
I slept for approx 1.5hrs last night due to headaches. Not amused!
Know the health benefits will be worth it tho.