I was on bedrest for almost 3 months with twins, and could only get up to use the bathroom. I followed my OB's orders to a T!!!! and had my twins at 35 weeks. They are now 9 and healthy so it was worth it all. I read a lot, watched TV and slept. It was very difficult at first but I kept picturing healthy kids and knew I had to do it. My religion is very important to me (Orthodox), and I did a lot of reading about its inception, theology, etc. It all changed my life; the best experience of my life. I would never had had the time to get into such reading. My priest would come and visit with me and we'd talk about it all.
The muscles--yes! I would turn and toss all night. I used pillows as a wedge. After the twins' birth, it hurt to even walk, so I worked out with weights to get my muscles back in shape. I was in better shape then than now, however! With three kids, I hardly have time to think about working out.
I had a great delivery, and was home the next day. Because i was on bedrest, I didn't have a lot post-pregnancy issues. My body wasn't taxed by the walking with extra pregnancy weight.
I also spent time catalog shopping.
Hope this helps. You will be very busy shortly, so really, just enjoy this time to do nothing, and try not to feel guilty!