Sleep The Third World of the Mind Author:Gay Gaer Luce, Julius Segal Learn what science has discovered about the myserious third world of the mind...about the varieties of sleep; the importance of alpha waves; the mysteries of REM sellp; sex and sleep; recurring biological rhythms; violent dreams and heart attack; body time and jet travel; sleep patterns and medical diagnosis; body changes during sleep; insomnia;... more » learning while asleep; why you need to sleep; the alarming effect of alcohol and drugs on sleep; nightmares and dreams« less