Head rushes when lying down

Hey all, I’m almost 20 weeks pregnant and the last 5 days or so, every time I get into bed and start to relax, I feel a head rush (almost feels as if my blood pressure drops) and it makes me anxious and I feel like I can’t fall asleep. Try to move different positions and eventually fall asleep after a while.

Is anyone else experiencing this or am I just crazy? Could it just be anxiety now that I stress about bed time because of it..

It doesn’t happen any other time except when I lie down relaxed and ready to sleep.