Neurobehavioral Performance in Young Adults Living on a 28-h Day for 6 Weeks - PMC
pmc.ncbi.nlm.nih.gov/articles/PMC2706904The decline in PVT performance suggests a cumulative effect of sleep loss across the 6-week study. Subjects did not accurately detect their declining PVT performance, and a motivational factor could not explain this decline.
Making my sleep schedule work for other people
Does the Dvorak keyboard increase typing speed?
skeptics.stackexchange.com/questions/2975/does-the-dvorak-keyboard-increase-typing-speedTL;DR: yes but not much