Insomnia

So people keep saying make sure you sleep a lot now so you can store it up for after the baby is born.  First off, can you store sleep?  I could see where you sleep a lot a day before you know you won't be able to sleep, but weeks in advance?  I don't think it works like that.  And second off...just how in the world am I supposed to be getting lots of sleep?  I miss sleep!  The multiple bathroom trips in the middle of the night really disrupt a deep sleep, but now I'm having problems falling asleep, and I keep waking up in the middle of the night wide awake!  And I look at my clock, convinced it must have been hours and hours since I last looked..and no its only been a hour and half. Its so frustrating.  My stomach is so uncomfortable all the time, and I wake up with my hips absolutely aching!  I always flip sides when I wake up, but it doesn't seem to help my hips at all.  And I do sleep with my pregnancy pillow, and it use to help, but now it doesn't.  I mean it's better then if I sleep without it, but I'm still miserable.  SOOOO any suggestions?  50 days left! But I can't really be counting down, excited about being able to sleep again, because pretty sure we all know that isn't going to get better after he's born.