I'm like that too and 13 weeks, I don't remember it being this bad with my other 2 but maybe it's selective memory I've been waking up at 3am and really struggling to stop my brain from racing, I end up with only a few hours sleep a night but if I steel a nap through the day It only makes it worse. I feel like a zombie at the moment.
Personaly I put it down to hormones playing havoc on my mind arg! hope it gets better for you soon