Alternately, one may "float" or have an out-of-body experience. Other characteristics include extreme vividness of the dream and bizarre and/or terrifying content".[8] Nickell also compared these symptoms with those experienced by people who claim to have been attacked by incubi, succubi or Hags from western folklore, and in more modern cases, with alien abductions. A book released in 2017 entitled "Popobawa: Tanzanian Talk, Global Misreadings" by Katrina Daly Thompson[9] was critical of Nickell, claiming that he was "associating Zanzibaris with fear and Westerners with skepticism".[10] Nickell responded that he agrees "Westerners should be wary of imposing simplistic patterns on another culture, but they also should not shy away from making scientific observations where appropriate".[11]