No sleep

I'm currently 38 weeks and 5 day's. I have really trouble sleeping. I can't sleep I don't know why. When I do and try to turn in bed I will wake up cause of pain. But never had a problem getting back to sleep. Once I changed position I would snap back to sleep. But it has been 2 nights that I just can't fall in sleep. I'm very tiered. Also no contractions but have been very moody like a crazy rollercoaster. Baby has dropped a long time ago. Pelvic floor hurts a lot. Very painful nipples is now a thing. And I am like hungry all the time. Any one any idea on why I can't sleep? Is like my body doesn't produce melanin or like when you're on a caffeine load. Has anyone had this?