People who cheated in an experiment had slept an average of 22.39 minutes less the night before than noncheaters, according to research led by Christopher M. Barnes of Virginia Tech. The study, in which cheaters overreported their scores on a test in order to gain financial advantage, shows that low levels of sleep are associated with unethical behavior. Managers who demand results that require employees to stay up late and miss sleep may be increasing the likelihood that workers will fudge results and engage in other forms of cheating, the
researchers suggest.

Source: Lack of sleep and unethical conduct