I'm 21 weeks and I have trouble breathing when I lay down to sleep at night. I haven't had a good night's rest in weeks. I have gained weight fast during this pregnancy but it is only 18pds and my weight isn't too bad for my height bc I'm 5"6" weighing 143lbs...maybe the weight gain could be a factor. Im to the point where Im scared to go to sleep bc of my breathing problems and I've developed insomnia. This has never happened in my life. Are any mothers having problems breathing when sleeping, no matter which position chosen to sleep in?