The Dori Dori No Mi is a fruit that is used to invoke beautiful, surreal images over an area around the user. These images have no actual matter or mass, so they don't affect anything other than their sight and hearing. Depending on how much it actually affects the target (or targets) in the area, it could actually cause them to fall asleep entirely. However, if the user of the fruit falls asleep in order to invoke its full power, the dream-like images are there to protect her and do her bidding.