I'm in the same boat. It's driving my bonkers! I do seem to fall asleep fine but then I'm up every two hours to go to the toilet. By 3am I'm wide awake AND I'm hungry. So I get up and have a bowl of cereal, get on BB and check my e-mails. By 5am I go back to bed and then I have my best sleep until around 6.30/7.00am. By the end of each day I feel like a wreck. I try to tell myself that it is training for when my baby is born but if I don't get some decent sleep soon I don't know how I will be able to manage with a newborn!