My 15 month old still wakes up around 5 every morning to nurse.  I co-sleep with her so we just lay together while she nurses and she falls back to sleep.  She doesn't always fall back to sleep but I tell her it is not time to get up yet and don't turn the lights on.  She will play for a little bit with her stuffed animals but usually falls back to sleep within 1/2 hour.  Not sure if this will help your situation but that is how I deal with it.

I have almost 7 months old, we have had sleeping issues (wasn't able to fall asleep on his own), I had contacted a sleep consultant (I picked a 2 week package) and my son is now a great sleeper. Here is Alanna's website http://www.goodnightsleepsite.com she will definately help you if you let her. My son sleeps 12 to 13 hours every night without waking up or nursing plus 2-3 naps a day. Alanna is very good and she knows what she's doing, I have a happy and rested family now thanks to her help.