Lightness.

The most important discovery during my research has been that during REM sleep, brain activity (when monitored) seems to mimic that which would have been expected during waking life activity, in comparison, non-REM sleep does not. Perhaps expectedly, it is during REM sleep where most dreaming occurs and during NREM sleep, dreaming is rare. It seems strange therefore, that sleepwalking happens during Non REM sleep, rather than the obvious conclusion that sleepwalkers are 'acting out their dreams'.

I want to work with the idea that sleepwalking is motion, or could be 'living' without thought or decision. When thinking about this idea it seemed to become easily intertwined with some existential theory, the idea of 'nothingness' 'lightness' and the 'juxtaposition of life & death'.
Sleepwalking in this respect would seem to perfectly counterbalance any existential crisis, and unbearable consciousness of your existence and surroundings. Where it is easier to not make decisions that you will be responsible for, you can achieve 'lightness' through your insignificance.