Does Your Brain Burn More Calories When You Think Hard?

 Someplace I read about thinking hard would need you to use 50% of your energy to fuel your brain. I can't find that article, so you'll have to read up on this yourself and see if your doctor has any clue about it.
I bet every survivor thinks hard at least 90% of the day and with lucid dreaming you can do it all night long.
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The original abstract here:

Glycemic instability and spontaneous energy intake: association with knowledge-based work.

 http://www.ncbi.nlm.nih.gov/pubmed/18725427

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 The Gizmodo writeup here:

 http://gizmodo.com/5927294/does-your-brain-burn-more-calories-when-you-think-hard

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A blogger dissecting it here:
http://littlegreenfootballs.com/page/280742_Does_Your_Brain_Burn_More_Calo
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Don't burn too many calories thinking about this.  Let your doctor burn up their brain, they have neurons to spare, we don't.