I've read that it is quite common to have nightmares in the third trimester - I'm sure it's just your unconscious brain's way of working through any stresses or anxieties related to pregnancy, babies and birth. I've had some crazy ones over the past few weeks...one in which I gave birth to a big, black dog (!), which began circling and stalking me as soon as it was born, and another in which my still-unborn daughter was born by clawing her way out of my skin! Oh, and she was a robot baby with one red and one green eye. I woke my husband up screaming both times, apparently!

Maybe someone needs to start a thread for the interpretation of crazy dreams during pregnancy?