A few weeks ago we experienced this as well after going nearly 8 hr stretches at night. I started concentrating on really tanking her up before I went to sleep (we cosleep too and are trying Pantley's methods) and when she tries to nurse for comfort or starts slipping into comfort sucking I use the Pantley Pull Off. She still seems to wake up once a night, but that is AOK with me at this point - she obviously still needs a feed then. For my baby this seemed to coincide with teething, during the day she wasn't feeding for long enough and also at times she just seemed to want the comfort. During the day, I found if I fed her when she was half asleep she nursed for longer, sometimes taking both sides. The key for me though is tanking her up when she is sleepy, alert she nurses briefly at times.