Wondering if anyone has had this problem and could offer a resolve. Currently 18 weeks but huge (nurse asked me if I was sure I wasn't smuggling two in there
) and checked with midwife yesterday about side/back sleeping. She said it's best to stay on left hand side henceforth, which shouldn't be a problem, I normally sleep on my side, however it's causing me now to wake up through the night with sciatica like achy pain. I use a pillow between my knees, had done even before pregnant for comfort, and I've read to try a pillow behind your back so you can theoretically shift your weight backwards without lying on your back, have used partner for that but I'm still in pain. I've just had a look at a pregnancy pillow on Amazon but it doesn't look like it would do much more than I've already tried. Any suggestions? I love my sleep 
Thanks in advance