John Axelsson, professor in sleep and expert in Neuroscience has together with a research group at Karolinska Institutet conducted a study measuring impaired cognitive abilities in newly awaken states. The study was done on doctors, a high-risk group of stress and sleep deprivation, working night shifts. Functions measured identify the impact on mathematical ability, word- and working memory etc.

Cognition is the root of all mental processes. Cognitive functions such as impulse control, working memory and problem-solving ability can all be affected by sleep/lack of sleep. These functions can be measured. With tools now available on the market.