Champix Withdrawal?

I know I'm not supposed to do this but I've been hating the sleep disturbance at night and the feeling that I had to sleep during the day (At least at weekends I could give way to it) that a week ago I cut back on the Champix to just having one in the morning.

I wasn't noticing any bad effects with the non-smoking and certainly have had better sleep pattens, but this morning I forgot to take the tablet.

I know that what's going on today is from my brain, but I don't know if it's brain chemistry or entirely psychological because I know I don't have my magic shield blocking receptors or if it's partially the chemical addiction, but I've noticed three things today

1. There's a funny bubbly feeling in my lungs, a feeling I know from when I've attempted to give up in the past cold turkey or with patches. Coming on today I think this has to be psychological.
2. I've been coughing up a little phlegm, like a weaker version of a smokers' cough. I haven't had that for several weeks.
3. I really really really wanted a cigarette at lunch time. If one had found its way into my hands I would have lit up.

So, what does this tell me? Thats' what I'm trying to work out. If I go back on the Champix they will run out in a week or two anyway.  Should I just stay off and tough it out? Is there some Champix giving up process or is it all psychological? If I go back on the Champix will it be just as bad in 2 weeks time?

For the moment, my plan is to sleep on it.

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Update 29 October 08:20

I decided to go back on the Champix. Had one before bed and have just had a second so for today, at least, I'm back on full strength,