Introduction– Sleep is vital to ensure normal human cognitive performance and cognitive enhancement. It has been found that not only sleep but even a short term nap can have some enhancing effect upon different aspect of cognitive performance of human brain. Present study is an attempt to assess whether sleep has any role in problem solving skills or not and if yes, which sleep stage is more involved in logical problem solving capabilities. Material and Method– Sixty eight healthy volunteers of the age group 18 to 24 years of age from both sexes has been recruited for the study after due ethical clearance from the Institutional Ethical committee. As a test protocol, all the participants including both case and control group were given a standard set of SUDOKU with graded difficulty levels. Each group participants were given 10 min. to 12 min. for each level. All the sleep study parameters were recorded and comparison was made between control and test group whether they are able to solve the given task and whether any of sleep stages that is slow wave sleep and REM sleep have any role to play in problem solving abilities. Results– Results showed that the test group volunteers have significantly better performance in the problem solving and completing the task in comparison to the control group individuals. Both slow wave sleep group individuals chi square value of 14.41 and P value of 0.0001) and REM sleep group individuals (chi square value of 8.988 and P value of 0.002) have shown significant difference when compared to the control group individuals for completion of task in time. Conclusion– In this study it has been observed that day time nap causes significant improvement in the problem solving skill in the human subjects comparative to wakeful rest period. Both slow wave sleep as well as REM sleep during the day time nap has shown significant impact upon the uncompleted numerical logical tasks suggesting nap being a useful behavior for cognitive enhancement.