3rd Tri sleeping tips?

Anyone have any tips to sleep?? 32 weeks and so uncomfortable! My snoogle pillow has been my BFF until a week ago. Now when I lay flat my ribcage feels so much pressure. The last few nights I've finally fallen asleep by propping myself into a sitting position against our headboard. Even that only lasts a short amount of time though. 
Any tips to get some sleep are much appreciated!!