fasting can't sleep

I already posted similar on another fasting forum but I am wondering if anyone has any ideas about how fasting affects your sleep. I always have some trouble sleeping but I started my fast yesterday and could not sleep at all last night, also had pains in my wrist. i have been drinking a lot of lemon juice in water, would this be why. Anyone with any clues as to how to get around the sleep thing. Please post, don't want to not be able to function at work.

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