I'm scared to fall asleep...

I'm scared to fall asleep. I've been feeling a bit off and weird like I can't describe it. I just feel weird and not myself like I feel I'm just off. I'm 36 +5 and I don't know what to do. Throughout this whole pregnancy I have never felt like this up until yesterday. And it's making my anxiety really high and I'm scared to fall asleep. It's stressing me out feeling weird and off and unusual and not myself, along with not knowing what to do... has anyone else felt like this? Should I be concerned?