This question has come up a lot lately. I suppose because we go 'safely and quietly insane' when we are sleeping , our unconscious mind unchecked is having a battle with our conscious mind.
If I am having symptoms they tend to be worse when I try to relax....Sarno wrote about this in Healing back Pain. It's just our pattern. I had one last night for the first time in weeks...Painful Leg spasms. I want to blame working hard for 9 hours without a break doing a miserable task... but I know better from experience. It's about something that I am nervous about..so When it woke me up ,I had a 'talk' with IT (the spasm/my brain) about the event causing me anxiety and I forcefully told it I will not be distracted... it took two times but it was gone by this morning and I slept the rest of the night fine.
Sometimes to break the cycle we need to get out of bed, out of our 'comfort zone' (which isn't really comfortable anyways) and approach it like: "OK... you want my attention? Your gonna get it and leave!"
I always talk to it like it is an annoying younger sibling... the 'attitude of disdain' that Sarno spoke of... it works pretty good!