it has been stated in abstract section that " While there is broad consensus that insufficient sleep leads to a general slowing of response speed and increased variability in performance, particularly for simple measures of alertness, attention and vigilance, there is much less agreement about the effects of sleep deprivation on many higher level cognitive capacities, including perception, memory and executive functions." the claim given above is not consistent with the research literature conducted prior to the study. its recommended to state such a sentence with caution.