I am pregnant in week 35 now. Every night, when I lie on my right side, after 5-10 minutes my sternum starts to hurt and it gets worse and worse (it is not related to any movement, it just comes). If I manage to fall asleep within those first minutes I wake up after one hour with an incredible pain, can hardly move. But once I manage to change position it just goes away. I never have it during the day (unless I lie down for a nap of course). It all started about one month ago and last night I got the same pain even when I layed on my left side. As pregnant I have no position left to sleep in now. Any ideas what could it be and what could help?