My wife is due in 6 weeks. The poor thing is having a horrible time getting sleep because she says she is so uncomfortable! What can I do at this stage to help her get some sleep.
At this point it is impossible to understand what she is going through. However, consider it to be like boot camp for when the baby comes. Try massaging her feet, getting her pillows and doing other things like that.
When my wife got to that point I tried to let her relax as much as possible. If it is possible see if you can help her get smaller naps throughout the day.