Have you tried cutting coffee from your own diet?!
It worked for me!!!
My DC3 would not take a bottle so was entirely breastfed. For 11 months he drove me crazy, hardly sleeping and often waking eight times a night. I tried all the advice in help books/mumsnet, to no avail.
Since cutting out coffee, he has only woken once at night. I feel like a teenager again!
Apologies if this is glaringly obvious, BUT why wasn't I told this?!