Tetris Vision is something I suffered from a lot as a kid.

It was usually brought on by a particularly heavy session of the GameBoy classic, Tetris, and a large dose of caffeine.

I would lay in bed staring at the far wall, the caffeine pumping through my body, keeping me awake. Staring blankly, I'd envision the tetris blocks falling from the ceiling. I’d fit a long one down the side of the wardrobe, a square one on top of the notice board. It used to drive me crazy. Closing my eyes didn't help either as I'd just envision the actual game, in full green and yellow glory. Perhaps I needed psychiatric help.

Tetris was the main culprit although I occasionally suffered from Sonic the Hedgehog Vision too, racing across the picture rail.