I'm not a big dummy supporter but if it gives you some respite and bub some comfort go for it! Have you tried lansinoh cream and those gel pads you freeze then put down your bra? They both helped me to get through the dark early days with breastfeeding.
From 4 weeks hubby gave bub a big evening bottle (10pmish) of expressed milk. It gave me a break and I think it helped to fill bub up and hence sleep better.
Good luck breastfeeding can suck in the early days (it pi$$ed me off that none of the classes mentioned that!). Bottom line do whatever you have to do. Xxx