Sleeping at 15 weeks

Please somebody help!! I'm 15 weeks and some change and sleeping is so uncomfortable. I toss and turn all night which in turn leaves me exhausted by morning. Not to mention countless pee trips to the restroom. I could go to bed as early as 730pm and by 700 am I'm still exhausted beyond belief!! What can I do? I also find myself on my back a lot and I was told I have an anterior placenta is this okay?? Help please I'm a FTM!! This is all so new and scary!!