This book is the first to scientifically explore the phenomenon of telepathic dreaming in depth. It recounts how psychiatrist Montague Ullman and psychologist Stanley Krippner conducted experiments to determine whether persons acting as senders can transfer their thoughts to the minds of sleeping receivers, thereby altering their dreams. Their results were astonishing: the researchers were able to verify several instances of telepathic communication between participants. Participants often gave uncannily accurate descriptions of images that the senders attempted to project to them – apparently confirming the reality of extrasensory perception during the dream state.