Anyone else struggle with sleep ?

I have such a hard time falling asleep. I put my two years old to bed at nine and then I'm awake for hours, even though I'm exhausted. When I finally do fall asleep I wake up just a few hours later with a sore back. Always the same spot, no matter my sleeping position. Then I wake up super early and feel like a zombie, but can't go back to sleep. My son takes a 2-3 hour nap after lunch, and even though I'm so tired by then I just cannot sleep like I used to. It's so frustrating!