Great concept, equally great execution. Beyond the fairly unique concept and controls, the theme of the game is very cohesive and satisfying. I found that I could kind of avoid the drowsiness mechanic by just wiggling one character every once in a while, but quickly realized that, as someone else said, the game is much more enjoyable (and easier!) when you explore your environment with both characters. There's also a surprising amount of replayability to everything, and recognizing areas and landmarks was a nice evolution to the gameplay. Simple but reat work!