Thats a good thing, try and remember that... cos otherwise you could be think loadsa shiznit that may feck you off or over.. If your brain decides not to think, try not to think about it.. and don't be distracted by the fact that there is nothing going on.. It's how it's supposeed to be..
The more we've got going on the more we think, the more the brain want's to give up..
Invite it back if it gets to far by offerit it a cup of tea and some short bread!!