Researcher Piotr Woźniak argues that the theory behind severe reduction of total sleep time by way of short naps is unsound, and that there is no brain control mechanism that would make it possible to adapt to the "multiple naps" system. Woźniak expresses concern that the ways in which the polyphasic sleepers' attempt to limit total sleep time, restrict time spent in the various stages of the sleep cycle, and disrupt their circadian rhythms will eventually cause them to suffer the same negative effects as those with other forms of sleep deprivation or circadian rhythm sleep disorder. Woźniak claims to have scanned the blogs of polyphasic sleepers and found that they have to choose an "engaging activity" again and again just to stay awake and that polyphasic sleep does not improve one's learning ability or creativity.