Green tea

Hi everyone,Last night I did not sleep at all well,which is unusual for me.I could not under stand why .Since Monday I have been waking up 4 or 5 times and then taking ages to get back to sleep.. I've just recently started drinking green tea,I'm beginning to think this is the reason. So no more green tea for me.Anyone else found herbal teas a problem?
Green tea does have caffiene in it. Maybe not as much as black tea, but still enough to be felt, especially if it's just before bed!