I always fed on demand with #1 (and continue to do so with #2) and it took until about 4 months where she got herself into any real schedule in terms of when she napped and slept. I don't know exactly when we got to the point where I was going longer stretches without feeding, but 6-8 weeks sounds early (and my 8wo certainly isn't there yet).
Unless you have some sort of medical reason (the baby isn't gaining enough weight, or you are having some sort of supply problem), I never saw any reason to wake to feed after the first few days. I'd let the baby sleep and not worry about it. If your boobs brimmeth over, try pumping a little to alleviate any discomfort.