Wendy, i agree with Lindseys mom, make sure you feed them every three hours during the day. And they are still very small (only due this week if i remember) they will need to be treated like a newborn for several more weeks. If you are consistant with the 3 hourly feeds during the day, and try a cluster feed at night, it may help. WE are at something like this right now:
7am - feed
10am - feed
1pm - feed
4pm - feed
6pm - feed (before bath)
7pm feed (after bath)
10.30pm - feed
Sam and Lydia will, i assume then wake around 3-4am ish. It may take a while, and they may do 2am, 5am 7am which is a killer, but they will get bigger soon and be past this stage before you know it!
If one gets up do you wake the other?