Perhaps your brain and body cry for more water indeed! To keep the engine running one should drink enough water. And not just any water, because there are differencies between the water.

I used to have headaches while activating, because I stressed too much about an exam I wanted to pass. I wanted to succeed and to get the best results and I wanted it all at once. Didn’t work.

Those days I photoread other subjects too, just for fun, and good results with those books showed me that photoreading really works despite my difficulties.
Then I had a little break due to summer holidays and didn't photoread at all for a while. The break did good to me.

Now I've begun photoreading again. I 'just do it' and don't think about it too much. Like a child when he/she plays.

Now I see PR as a game.
For instance, when postviewing or super-reading a book. My subconscious is the driver while I'm (with the conscious mind) sitting on the co-driver's seat with no worries and just enjoy the ride and can't wait where the driver is going to take me... This may sound a bit silly, but that's how I felt today :-)
When activating, I give the driver instructions where I want him to drive (=destination).